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Standard XII

Physics

Motional EMF

A coil has 20...

Question

A coil has 200 turns and area of $70 c m^{2}$ . The magnetic field perpendicular to the plane of the coil is $0.3 W b / m^{2}$ and take 0.1 sec to rotate through $180^{o}$ . The value of the induced e.m.f. will be

8.4 V

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84 V

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42 V

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4.2 V

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Solution

The correct option is A 8.4 V
Change in flux $= 2 B A N$

$∴$ Induced e.m.f. $= \frac{2 \times 0.3 \times 200 \times 70 \times 10^{- 4}}{0.1}$
$= 8.4 V$

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A coil has 200 turns and area of 70cm2. The magnetic field perpendicular to the plane of the coil is 0.3Wb/m2 and take 0.1 sec to rotate through 180o. The value of the induced e.m.f. will be

The correct option is A 8.4 VChange in flux =2BAN∴ Induced e.m.f. =2×0.3×200×70×10−40.1=8.4V

A coil has 200 turns and area of $70 c m^{2}$ . The magnetic field perpendicular to the plane of the coil is $0.3 W b / m^{2}$ and take 0.1 sec to rotate through $180^{o}$ . The value of the induced e.m.f. will be

The correct option is A 8.4 V
Change in flux $= 2 B A N$

$∴$ Induced e.m.f. $= \frac{2 \times 0.3 \times 200 \times 70 \times 10^{- 4}}{0.1}$
$= 8.4 V$