The length of a magnet is `16 cm`. Its pole strength is `250 milli.amp.m`. When it is cut into four equal pieces parallel to its axis, The magnetic length, pole strength and moments of each piece are: (respectively)

Options

A. 4 cm, 62.5 milli Am, 250 milli amp. `cm^(2)`
B. 8 cm, 500 milli Am, 400 milli amp. `cm^(2)`
C. 16 cm, 250 milli Am, 4000 milli amp. `cm^(2)`
D. 16 cm, 62.5 milli Am, 0.01 `A.m^(2)`

Answer

D

Explanation

Magnetic length remains same
Pole strength `m^(1)=m/4`
Magnetic moment = `M^(1)=M/4`