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  4. To measure the field B between the poles of an electromagnet, a small test loop of area 1 cm2, resistance 10 Ω and 20 turns is pulled out of it. A galvanometer shows that a total , charge of 2μ C passed through the loop. The value of B is

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Q. To measure the field B between the poles of an electromagnet, a small test loop of area $1\, cm^2$, resistance $10\,\Omega$ and 20 turns is pulled out of it. A galvanometer shows that a total , charge of $2\mu C$ passed through the loop. The value of B is

Electromagnetic Induction

Solution:

$q = \frac{e}{R} dt = \frac{(B_1 - B_2)NA}{R}$
$2 \mu c = \frac{(B - 0) 20 \times 10^{-4}}{10} = 0.01T$