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Physics · PYQ NEET UG 2019(1)
हिन्दीA 800 turn coil of effective area \( 0.05\text{ m}^2 \) is kept perpendicular to a magnetic field \( 5 \times 10^{-5}\text{ T} \). When the plane of the coil is rotated by \( 90^\circ \) around any of its coplanar axis in \( 0.1\text{ s} \), the e.m.f. induced in the coil will be:
Correct answer · Option 2
\( 0.02\text{ V} \)
Explanation
Induced emf \( e = \frac{N(B_f A - B_i A)}{t} = \frac{800 \times (0 - 5 \times 10^{-5} \times 0.05)}{0.1} = \frac{800 \times 2.5 \times 10^{-6}}{0.1} = 2 \times 10^{-2}\text{ V} = 0.02\text{ V} \).
