A metal rod of length 1m, rotates about its one end in a plane at right angles to a horizontal magnetic field of induction `7/22 xx 10^(-4)T`. If its

Question

A metal rod of length 1m, rotates about its one end in a plane at right angles to a horizontal magnetic field of induction `7/22 xx 10^(-4)T`. If its

A metal rod of length 1m, rotates about its one end in a plane at right angles to a horizontal magnetic field of induction `7/22 xx 10^(-4)T`. If its frequency of rotation is 10 Hz, then the magnitude of induced e.m.f. Is
A. 5mV
B. 1mV
C. 0.5V
D. 1V

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
Flux `phi=B.A. Area swept//sec= (dA)/(dt) = f cdot pi r^(2)`
`:. E = (d phi)/(dt)=B(dA)/(dt)=Bf cdot pi r^(2)`
`:. E = 7/22xx10^(-4)xx10xx22/7xx1^(2)=1 mV`.

5 views Answered 2023-02-05 15:29