Question 1 : If a galvanometer is shunted then among the&#160;following not true one is<br/>

Question 3 : A current of $10^{-5}$ A produces a deflection of $10^{0}$ ina moving coil galvanometer. A current of $10^{-6}$ ampin the same galvanometer produces a deflectionof<br><br><br>

Question 4 : The current that must flow through the coil of a galvanometer so as to produce a deflection of one division on its scale is called<br>

Question 5 : Two parallel wires carrying current in the same direction attract each other because of<br>

Question 6 : An 8 cm long wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. If the magnetic field inside the solenoid is 0.3 T, then magnetic force on the wire is

Question 7 : In cyclotron, radius of circular path traced by positive ions is ____________.

Question 8 : A galvanometer of resistance $50\Omega $ is connected to a battery of $3 V$ along with a resistance of $2950\Omega $ in series shown, full-scale deflection of $30$ divisions. The additional series resistance required to reduce the deflection to $20$ divisions is

Question 9 : If the current is doubled, the deflection is also doubled in

Question 10 : The sensitiveness of a moving coil galvanometercan be increased by decreasing<br>

Question 11 : Assertion: The coil is bound over the metallic frame in moving coil galvanometer. Reason: The metallic frame helps in making steady deflection without any oscillation.

Question 12 : A small coil of N turns has an area A and a currenti flows through it. The magnetic dipole momentof the coil will be<br>

Question 13 : A rectangular loop carrying a current $i$ is placed&#160;in a uniform magnetic field $B$. The area enclosed&#160;by the loop is $A$. If there are $n$ turns in the loop,&#160;the torque acting on the loop is given by<br/>

Question 14 : The radial magnetic field is used in a suspendedcoil galvanometer to provide<br>

Question 15 : A wire of length $L$ is made in the form of a coil in a moving coil galvanometer. To have maximum sensitiveness the shape of the coil is&#160;<br/>

Question 17 : Assertion: Cyclotron is a device which is used to accelerate the positive ions Reason: Cyclotron frequency depends upon the velocity

Question 18 : A charged particle of mass $m$ and charge $q$ travels on a circular path of radius $r$ &#160;that is perpendicular to the magnetic field $B$. The time taken by the particle to complete one revolution is :<br/>

Question 19 : A proton enters a region of constant magnetic field, $B$, of magnitude $1.0$ tesla with&#160;initial speed of $1.5 \times {10}^{6} {m}/{s}$&#160;. If the protons initial velocity vector makes an angle of ${30}^{o}$&#160;with the direction of $B$. Calculate the&#160;speed of&#160;the protons&#160;$4$ seconds after entering the&#160;magnetic field.

Question 20 : The total number of turns and cross section area in a solenoid is fixed. However, its length $L$ is varied by adjusting the separation between windings. The inductance of solenoid will be proportional to:

Question 21 : A uniform magnetic field is at right angles to the direction of motion of protons. As a result the protons describes a circular path of radius $2.5\ cm$. If the speed of the protons is doubled, then the radius of the circular path will be<br>

Question 22 : When a proton moves in a uniform magnetic field, the&#160;momentum change but its kinetic energy does not change because :

Question 23 : Two circle coils P and Q are made from similar wire, but radius of Q is twice that of P. What should be the valueof potential difference across them so that the magnetic induction at their centre may be same?

Question 24 : A small current carrying loop of area $A$ behaves like a tiny magnet of magnetic moment $M$. Current in the loop is

Question 25 : An electron is revolving in a circular path of radius $2.0\times 10^{-10}$ m with a uniform speed of $3\times 10^6 m/s$. The magnetic induction at the centre of the circular path will be<br>

Question 26 : Two long thin parallel conductor are kept very close to each other without&#160; touching. One carries a current $i$ and the other has charge $\lambda$ per unit length. An electron moving parallel to the conductor is undeflected. lf &#160;$c$ is the velocity of light. then :<br/>

Question 27 : An electron and a proton enter a magnetic field perpendicularly both have same kinetic energy. Which of the following is true?

Question 28 : A proton and a deuteron ion having the same kinetic energies enter a region of uniform magnetic field perpendicularly. Deuteron's mass is twice that of proton. Calculate the ratio of the radii of their circular paths.

Question 29 : A circular coil carrying current 'I' has a radius 'R' and magnetic field at the center is 'B'. At what distance from the center along the axis of the same coil, the magnetic field will be $\dfrac{B}{8}$?

Question 30 : A horizontal wire 0.1 m long carries a current of 5 A. Find the magnitude of the magnetic field, which can support the weight of the wire. Assume wire to be of mass $3 \times 10^{-3}kg &#160;m^{-1}$ :<br/>