First slide

Faraday's law of Electromagnetic induction

Question

A rectangular coil of 20 turns and area of cross-section 25 cm² has a resistance of 100 ohm. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of 1000 tesla per second, the current in the coil is

Moderate

Solution

$i = \frac{| e |}{R} = \frac{N}{R} \cdot \frac{ΔB}{Δt} Acosθ$
$= \frac{20}{100} \times 1000 \times (25 \times 10^{- 4}) \cos 0^{\circ}$
$\Rightarrow i = 0 .5 A$

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