Assertion If a bar magnet is split parallel to its length in n parts, then magnetic moment of each part becomes 1 / n times. Reason In this case the pole strength of each part remains as before but length becomes 1 / n times.

Question

Assertion If a bar magnet is split parallel to its length in n parts, then magnetic moment of each part becomes 1 / n times. Reason In this case the pole strength of each part remains as before but length becomes 1 / n times. (A) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion (B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion (C) If Assertion is true but Reason is false (D) If Assertion is false but the Reason is true

Tardigrade Admin · Accepted Answer

The magnet is cut parallel to its length of its each part will be of the same length as previous but the pole strength of each part,

= \frac{1}{n} \times

initial pole strength

∴ m^{'} = \frac{m}{n}

Therefore, the magnetic moment

= m^{'} \times l^{'} = \frac{m}{n} \times l = \frac{1}{n} (m l) = \frac{M}{n}

Hence, the magnetic moment of each part becomes

1/ n

times.

Q. Assertion If a bar magnet is split parallel to its length in n parts, then magnetic moment of each part becomes 1/n times. Reason In this case the pole strength of each part remains as before but length becomes 1/n times.

If both Assertion and Reason are true and the Reason is correct explanation of the Assertion

If both Assertion and Reason are true but Reason is not correct explanation of the Assertion

If Assertion is true but Reason is false

If Assertion is false but the Reason is true

Q. Assertion If a bar magnet is split parallel to its length in $n$ parts, then magnetic moment of each part becomes $1/ n$ times.
Reason In this case the pole strength of each part remains as before but length becomes $1/ n$ times.