Question 1 : The unit of physical quantity obtained by the line integral of electric field is?

Question 5 : In a neon gas discharge tube $Ne^+$ ions moving through a cross-section of the tube each second to the right is $2.9 \times 10^{18}$, while $1.2 \times 10^{18}$ electrons move towards left in the same time; the electronic charge being $1.6 \times 10^{-19}\ C,$ the net electric current is

Question 6 : For $20\ \Omega$ resistance are connected in series and the combination is connected to a $20\ V$ emf. The potential difference across any one of the resistors is

Question 7 : A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is somehow decreased in the resistor (for example, by cooling it), the current will

Question 8 : Two identical thin rings, each of radius $10 cm$ carrying charges $10 C$ and $5 C$ are coaxially placed at a distance $10 cm$ apart. The work done in moving a charge $q$ from the centre of the first ring to that of the second is

Question 9 : A capacitor of capacitance $2\mu F$ is charged to a potential difference $12$ V. The charging battery is then removed and the capacitor is connected to an inductor of an inductance of $0.6$mH. At the time when the potential difference across the capacitor drops to $6.0$V, the current in the circuit is?

Question 11 : The value of resistance is 10.845 $\Omega$ and the current is 3.23 A. On multiplying, we get the potential difference is 35.02935 V. The value of potential difference in terms of significant figures would be:

Question 12 : Calculate the work done to move a charge $5$ C between two points A and B, if both the points are maintained at same potential of $6$ V

Question 13 : <span>How much work would be required to move a proton from the negative to the positive plate?</span>

Question 14 : Heat flows radially outward through a spherical shell of outside radius $R_{2}$ and inner radius $R_{1}$. The temperature of inner surface is $\Theta _{1}$ and that outer is $\Theta _{2}$. At what radial distance fro m center of shell the temperature is just half way between $\Theta _{1}$ and $\Theta _{2}$

Question 15 : A number of condensers, each of capacitance $1\mu F$ and each one of which gets punctured if a potential difference just exceeding $500\ V$ is applied, are provided. An arrangement suitable for giving capacitance of $2\mu F$ across which $3000$ volt may be applied requires at least.

Question 16 : In an electromagnetic spectrum, identify which of the following lists are ordered from longest wavelength to shortest wavelength? <br/>

Question 18 : When cathode rays strike a metal target of high melting point with very high velocity, then

Question 21 : A capacitor is a passive electronic component that stores energy in the form of an electrostatic field.

Question 23 : A parallel plate air condenser consists of two circular plates of diameter 8 cm. At what distance should the plates be placed so as to have the same capacity as that of a sphere of diameter 20 cm ?

Question 25 : A capacitor is connected to a battery of voltage $V$. Now a di-electric slab of di-electric constant $k$ is completely inserted between the plates, then the final charge on the capacitor will be: (If initial charge is $q_{0}$).<br>

Question 26 : Eight drops of Hg (equal radii), which have equal charge constitute a bigger drop. The capacitance of bigger drop in comparison to small drop is :<br/>

Question 27 : A cylindrical capacitor has two co-axial cylinders of length $20cm$ and radii $1.5cm$ and $1.6cm$. The outer cylinder is earthed and inner cylinder is given a charge of $4\mu C$. The capacitance of the system is (neglect end effects)

Question 28 : The capacitance of spherical conductor of radius r is proportional to :<br/>

Question 29 : Consider the two idealised systems<br/>(i) a parallel plate capacitor with large plates and small separation and<br/>(ii) a long solenoid of length $L &gt;&gt; R$, radius of cross - section.<br/>In (i) $\bar{E}$ is ideally treated as a constant between plates and zero outside. In (ii) magnetic field is constant inside the solenoid and zero outside. These idealised assumptions, however, contradict fundamental laws as below.

Question 30 : Two identical capacitors are connected in series with a source of potential V. If Q is the charge on one of the capacitors, the capacitance of each capacitor is:&#160;

Question 31 : The capacity of an isolated sphere of radius $9 cm$ is $C$. When it is connected to an earthed concentric thin hollow sphere of radius $R$, the capacity becomes $10 C$. Then the value of $R$ is

Question 32 : Two identical metal plates are given positive charge ${Q}_{1}$ and ${Q}_{2}$ $\left( &lt;{ Q }_{ 1 } \right)$ respectively. If they are now brought close together to form a parallel plate capacitor with capacitance $C$, the potential difference between them is

Question 33 : The frequency for which $5\mu F$ capacitor has a reactance of $10,000 \Omega$ is

Question 34 : A very thin metal sheet is inserted halfway between the parallel plates of an air-gap capacitor. The sheet is thin compared to the distance between the plates, and it does not touch either plate when fully inserted. The system had capacitance, $C$, before the plate is inserted.<br>What is the equivalent capacitance of the system after the sheet is fully inserted?

Question 35 : A capacitance is formed by two identical metal plates. The plates are given charges $Q_1$ and $Q_2 (Q_2 &lt; Q_1) $ . If capacitance of the capacitor is $C,$ what is the p.d. between the plates?

Question 36 : The hysteresis cycle for the material of a transformer core is

Question 39 : The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to

Question 41 : A paramagnetic liquid is taken in a U-tube and arranged so that one of its limbs is kept between pole pieces of the magnet. The liquid level in the limb

Question 42 : A loosely wound helix made of stiff wire is mounted vertically with the lower end just touching a dish of mercury. When a current from a battery is started in the coil through the mercury

Question 43 : Alpha particles {tex} \left( \mathrm { m } = 6.7 \times 10 ^ { - 27 } \mathrm { kg } , \mathrm { q } = + 2 \mathrm { e } \right) {/tex} are accelerated from rest through a potential difference of 6.7 {tex} \mathrm { kV } {/tex}. Then, they enter a magnetic field {tex} \mathrm { B } = 0.2 \mathrm { T } {/tex} perpendicular to them direction of their motion. The radius of the path described by them is

Question 44 : When a charged particle moving with velocity is subjected to a magnetic field of induction {tex} \overrightarrow { \mathrm { B } } , {/tex} the force on it is non- zero. This implies that

Question 45 : A 10 eV electron is circulating in a plane at right angles to a uniform field at magnetic induction {tex} 10 ^ { - 4 } \mathrm { Wb } / \mathrm { m } ^ { 2 } ( = 1.0 {/tex} gauss). The orbital radius of the electron is

Question 46 : In the given figure, what is the magnetic field induction at point {tex} \mathrm { O } ? {/tex}<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e99a40fdebb574cf701648f"><br>

Question 47 : A cable carrying a direct current is burried in a wall which stands in a north-south plane. A horizontal compass needle on the west side of the wall is found to point towards south instead of north. The coil is laid

Question 49 : A dip needle lies initially in the magnetic meridian when it shows an angle of {tex} \operatorname { dip } \theta {/tex} at a place. The dip circle is rotated through an angle {tex} x {/tex} in the horizontal plane and then it shows an angle of {tex} \operatorname { dip } \theta ^ { \prime } {/tex} . Then {tex} \frac { \tan \theta ^ { \prime } } { \tan \theta } {/tex} is

Question 50 : A particle of mass {tex} \mathrm { m } , {/tex} charge {tex} \mathrm { Q } {/tex} and kinetic energy T enters a transverse uniform magnetic field of induction {tex} \overrightarrow { \mathrm { B } } {/tex} . After 3 seconds, the kinetic energy of the particle will be:

Question 51 : The length of a magnet is large compared to its width and breadth. The time period of its oscillation in vibration magnetometer is <b>2s</b>. The magnet is cut along its length into three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be

Question 52 : If the period of oscillation of freely suspended bar magnet in earth's horizontal field {tex} \mathrm { H } {/tex} is 4 sec. When another magnet is brought near it, the period of oscillation is reduced to 2{tex} \mathrm { s } {/tex} . The magnetic field of second bar magnet is

Question 53 : The number of turns in primary and secondary coils of a transformer is 50 and 200 respectively. If the current in the secondary coil is 4A, then the current in the secondary coil is

Question 55 : Current in a coil changes from 5 A to 10 A in 0.2 s. If the coefficient of self-induction is 10 H, then the induced emf is

Question 56 : The primary winding of a transformer has 200 turns and its secondary winding has 50 turns. If the current in the secondary winding is 40 A, the current in the primary is

Question 57 : Fig shown below represents an area A = 0.5 {tex}m^{2}{/tex} situated in auniform magnetic field B = 2.0 {tex}weber/m^{2}{/tex} and making an angle of {tex}60^{\circ}{/tex} with respect to magnetic field. <br> <img style='object-fit:contain' src="https://data-screenshots.sgp1.digitaloceanspaces.com/5d6104c0ca41306d7a32411d.jpg" /> <br> The value of the magnetic flux through the area would be equal to

Question 58 : There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then

Question 60 : In the figure shown, three AC voltmeters are connected. At resonance<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5d60f041e5db655bbf10a60f"><br>

Question 61 : The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was

Question 62 : In a series resonant LCR circuit, the voltage across {tex} R {/tex} is 100 volts and {tex} R = 1 \mathrm { k } \Omega {/tex} with {tex} \mathrm { C } = 2 \mu \mathrm { F } {/tex} . The resonant frequency {tex} \omega {/tex} is {tex} \mathrm {200 rad } / \mathrm { s } {/tex} . At resonance, the voltage across {tex} L {/tex} is

Question 63 : A coil having 500 square loops each of side 10 cm is placed normal to a magnetic field which increases at the rate of 1 <img style='object-fit:contain' width='43' height='20' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea2894b8ab67a08eba54cc6"> The induced emf is

Question 64 : A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earth's magnetic field is {tex} 0.2 \times 10 ^ { - 4 } \mathrm { T } {/tex} , then the e.m.f. developed between the two ends of the conductor is

Question 65 : An ac source of angular frequency {tex} \omega {/tex} is fed across a resistor r and a capacitor {tex} C {/tex} in series. The current registered is I. If now the frequency of source is changed to {tex}\large \frac {\omega}{3} {/tex} (but maintaining the same voltage), the current in the circuit is found to be halved. The ratio of reactance to resistance at the original frequency {tex} \omega {/tex} is

Question 66 : The self inductance of a long solenoid cannot be increased by

Question 67 : Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. The induced current in the inner loop <br><img style='object-fit:contain' src="https://data-screenshots.sgp1.digitaloceanspaces.com/5d6105b49c699b6d4e70033f.jpg" />

Question 68 : The current in a {tex} L R {/tex} circuit builds up to {tex} \frac { 3 } { 4 } \mathrm { th } {/tex} of its steady state value in 4{tex} \mathrm { s } {/tex} . The time constant of this circuit is

Question 69 : A bulb is rated at {tex} 100 \mathrm { V } , 100 \mathrm { W } {/tex}, it can be treated as a resistor. Find out the inductance of an inductor (called choke coil) that should be connected in series with the bulb to operate the bulb at its rated power with the help of an ac source of {tex} \mathrm {200 V } {/tex} and {tex} \mathrm { 50Hz } {/tex} .

Question 70 : In an A.C. circuit, the current flowing in inductance is {tex} \mathrm { I } = 5 \sin ( 100 \mathrm { t } - \pi / 2 ) {/tex} amperes and the potential difference is {tex} \mathrm { V } = 200 \sin ( 100 \mathrm { t } ) {/tex} volts. The power consumption is equal to