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#1 | Analogy b/w Electrostatics & Magnetostatics

(Physics) > Magnetism and Matter

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Related Practice Questions :

A magnet of magnetic moment 20 C.G.S. units are freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of ${30}^{o}$ in C.G.S. units is

(a) 6

(b) $3\sqrt{3}$

(c) $3(2-\sqrt{3})$

(d) 3

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The magnetic field due to a short magnet at a point on its axis at distance X cm from the middle point of the magnet is 200 Gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is

1. 100 Gauss 2. 400 Gauss

3. 50 Gauss 4. 200 Gauss

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Force between two identical bar magnets whose centres are *r* *metre* apart is 4.8 *N*, when their axes are in the same line. If separation is increased to 2*r*, the force between them is reduced to

1. 2.4*N* 2. 1.2*N*

3. 0.6*N* 4. 0.3*N*

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A bar magnet of magnetic moment 10^{4}*J/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 4×10^{–5} *T* to a direction 60° from the field will be

1. 0.2 *J* 2. 2.0 *J*

3. 4.18 *J* 4. 2 × 10^{2 }*J*

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A magnet of magnetic moment $50\hat{i}A-{m}^{2}$ is placed along the *x*-axis in a magnetic field $\overrightarrow{B}=(0.5\hat{i}+3.0\hat{j})T$. The torque acting on the magnet is

1. 175 $\hat{k}$ N-m

2. 150 $\hat{k}$

3. 75 $\hat{k}$ N-m

4. 25$\sqrt{37}$ $\hat{k}$ N-m

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