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  4. A closely wound solenoid of 800 turns has area of cross section 2.5 cm 2. Magnetic moment (in J/T) associated with it, when it carries a current of 3 A is -

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Q. A closely wound solenoid of $800$ turns has area of cross section $2.5\, cm ^{2}$. Magnetic moment (in $J/T$) associated with it, when it carries a current of $3\, A$ is -

Magnetism and Matter

Solution:

$M = NiA$
$=800 \times 3 \times 2.5 \times 10^{-2}=0.6\, JT ^{-1}$