CBSE Class 12 Physics Magnetism and Matter Quiz 3

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CBSE › Class 12 › Physics › Magnetism and Matter

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1. In a bar magnet, magnetic lines of force z :

A are produced only at north pole like rays of light from a bulb B starts from north pole and ends at the south pole C emerge in circular paths from the middle of the bar D run continuously through the bar and outside

2. The Mariner's compass is provided with Gimbals arrangement so as to :

A keep the needle always horizontal B give a direct reading of declination C give the direct value of dip D all of the above

3. A wire of length I has a magnetic moment M. It is then bent into a semi-circular arc. The neyv magnetic moment is :

A M B M.l. C \(\frac{2M}{π}\) D \(\frac{M}{π}\)

4. The relation between geometric length (L) and magnetic length (L_m) is:

A L_m = \(\frac{5}{6}\) L_g B L_m = \(\frac{6}{5}\) L_g C (a) L_m = L_g D L_m = 2RY;UL L_g

5. The radius of curvature of the path of charged particle in a uniform magnetic file is directly proportional to the

A charge on fie particle B Momentum of particle C energy of particle D Strength of field

6. The magnetic field at the centre of a current carrying circular loop is B. If the radius of the loop is doubled keeping the current unchanged, the magnetic field at the centre of loop will become:

A \(\frac{B}{2}\) B \(\frac{B}{4}\) C 2B D 4B

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