E=BωAsinωt
15.4×10−3=21×100×722r2×21
r=2215.4×28×10−5
R=14 mm
JEE Main 2026 — Physics Electromagnetism
A conducting circular loop is rotated about its diameter at a constant angular speed of 100rad/s in a magnetic field of 0.5 T perpendicular to the axis of rotation. When the loop is rotated by 30∘ from the horizontal position, the induced EMF is 15.4 mV. The radius of the loop is ____ mm. (Take π=722)
Held on 22 Jan 2026 · Verified 6 Jul 2026.
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