Q

# Help me solve this - Magnetic Effects of Current and Magnetism - JEE Main-3

A 25 cm long solenoid has radius 2cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to a magnet of the same size and magnetization (magnetic moment/volume), then is

• Option 1)

• Option 2)

• Option 3)

• Option 4)

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As we learnt in

Magnetic moment (M) -

M=NiA

- wherein

N-number of turns in the coil

i-current throughout the coil

A-area of the coil

$|\vec{M}|=\frac{NiA}{Al}=\frac{Ni}{l}=\frac{(500)\times 15}{25\times 10^{-2}}=30000\ Am^{-1}$

Option 1)

Incorrect

Option 2)

Correct

Option 3)

Incorrect

Option 4)

Incorrect

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