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CBSE
Class 12 Physics
Magnetism And Matter
Quiz 2
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In a bar magnet, magnetic lines of force z :
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are produced only at north pole like rays of light from a bulb
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starts from north pole and ends at the south pole
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emerge in circular paths from the middle of the bar
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run continuously through the bar and outside
Explanation
starts from north pole and ends at the south pole
The Mariner's compass is provided with Gimbals arrangement so as to :
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keep the needle always horizontal
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give a direct reading of declination
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give the direct value of dip
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all of the above
Explanation
give the direct value of dip
A wire of length I has a magnetic moment M. It is then bent into a semi-circular arc. The neyv magnetic moment is :
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M
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M.l.
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\(\frac{2M}{π}\)
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\(\frac{M}{π}\)
Explanation
\(\frac{2M}{π}\)
The relation between geometric length (L) and magnetic length (L
m
) is:
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L
m
= \(\frac{5}{6}\) L
g
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L
m
= \(\frac{6}{5}\) L
g
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(a) L
m
= L
g
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L
m
= 2RY;UL L
g
Explanation
L
m
= \(\frac{5}{6}\) L
g
The radius of curvature of the path of charged particle in a uniform magnetic file is directly proportional to the
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charge on fie particle
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Momentum of particle
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energy of particle
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Strength of field
Explanation
Momentum of particle
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:
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\(\frac{B}{2}\)
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\(\frac{B}{4}\)
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2B
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4B
Explanation
\(\frac{B}{4}\)
0 h : 0 m : 1 s
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