Question 2 : The space surrounding a magnet within which the magnetic effect is felt is called

Question 3 : To find the S-pole of a compass is to find the end of the compass needle that :<br>

Question 5 : The power of attraction of a .................. magnet is twice as compared to similar bar magnet.<br><br>

Question 7 : <span>State whether true or false :</span><div><span>The pattern of the magnetic field around a conductor due to electric current flowing through it depends on the shape of the conductor.</span></div>

Question 8 : <span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"></span></span><p class="wysiwyg-text-align-left">The magnitude of magnetic moment of a semi circular magnet of radius $r$ and pole strength $m$ is :<br/></p>

Question 10 : What happens when a bar magnet is broken into two pieces ?<br/>

Question 11 : To protect an instrument from e<span>xternal magnetic field</span>, it is put inside an iron box.

Question 12 : If r be the distance of a point on the axis of a bar magnet from its centre, the magnetic field at this point is proportional to :<br>

Question 13 : What do you call the angle of inclination of the axis of the magnetic needle to the horizontal plane when suspended freely ?<br/>

Question 14 : Which of the following is/are correct regarding location of a bar magnet?

Question 15 : In the right-hand thumb rule, where does the thumb point to?

Question 18 : Which of the following statements is wrong ? Magnetic lines of force

Question 19 : A magnetic needle oscillates in a horizontal plane with a period T at a place where the angle of dip is $60^{0}$. When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, its period will be

Question 20 : If a spring is magnetized, then after magnetization, its length will:

Question 21 : The earth's magnetic field at some place on magnetic equator of the earth is $0.5\times { 10 }^{ -4 }T$. Consider the radius of the earth at that place as $6400 km$. Then, magnetic dipole moment of the earth is ___________ ${ Am }^{ 2 }$. $\left( { \mu }_{ 0 }=4\pi \times { 10 }^{ -7 }Tm{ A }^{ -1 } \right) $

Question 23 : Whose magnetic field is like a magnetic field of a bar magnet?<br>

Question 24 : A long horizontal metallic rod with length along the east-west direction is falling under gravity. The potentiol difference between its two ends will :

Question 25 : A circular coil of radius 10 cm having 100 turns carries a current of 3.2 A. The magnetic field at the centre of the coil is:<br/>

Question 26 : Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance $ d $ from the centre of magnet will be or The magnetic field at a distance $ d $ from a short bar magnet in longitudinal and transverse positions are in the ratio

Question 28 : With the help of which law the direction of a magnetic field can be decided?<br>

Question 29 : When the strength of the current flowing through a coil is increased, which of the following statements is true for it?

Question 30 : The direction of magnetic field lines in a region outside the bar magnet are ......................................<br>

Question 31 : At the magnetic poles of magnet, its attractive power is minimum.<br>

Question 32 : A thin straight vertical conductor has $10amp$ current flows vertically upwards. It is present at a place where ${B}_{H}=4\times {10}^{-6}T$. At which point magnetic feild will be maximum

Question 33 : If $B_E$ represents equatorial magnetic field and $B_A$ represents axial magnetic field due to a bar magnet. Which of the following relationships between $B_E$ and $B_A$ is correct?

Question 34 : A short bar magnet placed on the table along the north south line. Its north pole is directed towards geographical north then location of neutral points is?

Question 35 : Assertion: The poles of magnet cannot be separated by breaking into two pieces. Reason: The magnetic moment will be reduced to half when a magnet is broken into two equal pieces.

Question 36 : Who had first observed the magnetic effect of an electric current?<br>

Question 37 : In a long hollow vertical metal pipe a magnet is dropped. During its fall, the acceleration of magnet

Question 38 : Assertion: The net magnetic force on a current loop in a uniform magnetic field is zero but torque may or may not be zero. Reason: Torque on a current carrying coil in a magnetic field is given by $\bar \tau= nI(\bar A X \bar B).$

Question 39 : A small bar magnet has a magnetic moment $1.2 { A } - { m } ^ { 2 }.$ The magnetic field at a distance $0.1 { m }$ on its axis will be : $\left( \mu _{ { 0 } }=4\pi \times 10^{ { -7 } }{ Tm }/{ A } \right) $

Question 40 : When the N-pole of a magnet is placed near the S-pole of another magnet then it _______ the south pole.<br/>

Question 41 : The magnetic induction in air at a distance $ d $ from an isolated point pole of strength $ m $ unit will be

Question 42 : In a plane perpendicular to the magnetic meridian the dip needle will remain :

Question 43 : A bar magnet of magnetic moment $10^4J/T$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $ 4 \times 10^{-5} T $ to a direction $ 60^o $ from the field will be

Question 44 : Assertion: We cannot think of magnetic field configuration with three poles. Reason: A bar magnet does exert a torque on itself due to its own field.

Question 45 : A bar magnet of magnetic moment $1.2A{ m }^{ 2 }$ is placed in the magnetic meridian with its south pole pointing the north. If a neutral point is found at a distance of 20cm from the centre of the magnet, the value of the horizontal component of the earth's magnetic field is :

Question 46 : The time period of a bar magnet suspended horizontally in the earth's magnetic field and allowed to oscillate

Question 47 : The magnetic flux linked with a coil varies as $\phi =3t^2+4t+9$. The magnitude of the emf induced at $t=2$ seconds is?

Question 48 : A body at rest starts from a point at a distance r (&gt;R) from the center of the earth. If M and R stand for the mass and the radius of earth respectively, then the speed of the body when it reaches the Earth surface is

Question 49 : A straight wire carries current toward the east.<br>What is the direction of the magnetic field directly below the wire?

Question 51 : Two small bar magnets are placed in a line with like poles facing each other at a certain distance $ d $ apart. If the length of each magnet is negligible as compared to $ d $, the force between them will be inversely proportional to

Question 52 : A jet plane having a wing-span of $25$ m is travelling horizontally towards east with a speed of $3600$ km/hour. If the Earth's magnetic field at the location is $4\times 10^{-4}$T and the angle of dip is $30^o$, then, the potential difference between the ends of the wing is?

Question 53 : A magnetic needle suspended horizontally by an unspun silk fibre oscillates in the horizontal plane, because of the restoring force originating mainly from

Question 54 : If a piece of metal was thought to be magnet, which one of the following observations would offer conclusive evidence

Question 56 : A magnetizing field of 1600A/m producers a magnetic flux of 2 x $10^{-5}$ Wb in a bar of iron of cross section 0.2 x $10^{-4}m^2$. Calculate the susceptibility of the bar.

Question 57 : A magnetic needle vibrates in a vertical plane parallel to the magnetic meridian about horizontal axis passing through its centre. The frequency is $\pi$. If the plane of oscillation turned about a vertical axis by ${90}^{o}$, the frequency of oscillation in vertical plane will be: