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Q.

If a bar magnet of pole strength ‘m’ and magnetic moment ‘M’ is cut equally 4 times parallel to its axis and 5 pieces perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively

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a

$\frac{m}{4}, \frac{M}{20}$

b

$\frac{m}{20}, \frac{M}{20}$

c

$\frac{m}{5}, \frac{M}{20}$

d

$\frac{m}{5}, \frac{M}{4}$

answer is B.

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Detailed Solution

$m^{1} = \frac{m}{5}, M^{1} = \frac{M}{5 \times 4}$

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