A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is (a) four times per revolution (b) six times per revolution (c) once per revolution (d) twice per revolution

Answer: (d). e = e₀sin ω t changes sign when sin ω t passes through zero. In one revolution ( 0 to 2π) that happens at π and 2π: two times. So the answer is (d) twice per revolution.

A wire loop is rotated in a magnetic field. The frequency of change… | NEET 2013

Q32NEET 2013Easy

Rotating Conductors & AC Generator

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is

Show answer and solution

Answer: (d)

$e = e_0\sin\omega t$ changes sign when $\sin\omega t$ passes through zero.
In one revolution ( $0$ to $2\pi$ ) that happens at $\pi$ and $2\pi$ : two times.
So the answer is (d) twice per revolution.

Report a mistake

More questions on Rotating Conductors & AC Generator

A metallic rod of length '' is tied to a string of length 2 and made to rotate with…JEE Main 2013
A metal conductor of length 1 m rotates vertically about one of its ends at angular…JEE Main 2004 (AIEEE)
In a uniform magnetic field of induction B a wire in the form of a semicircle of radius r…JEE Main 2004 (AIEEE)
A conductor of length 1 m rotates vertically about one of its ends at angular velocity 5…MHT CET 2026 (14 May, Shift 1)
A conducting rod AC of length 4L is rotated counter-clockwise about a point O in a…MHT CET 2026 (15 May, Shift 1)
A conducting rod AB of length l is rotated about point O which lies between point A and B…MHT CET 2026 (12 May, Shift 1)
A conducting circular loop is rotated about its diameter at a constant angular speed of…JEE Main 2026 (22 Jan, Shift 2)
A metal rod of length L rotates about one end at origin with a uniform angular velocity…JEE Main 2026 (5 Apr, Shift 2)

Rotating Conductors & AC Generator question from NEET 2013

More questions on Rotating Conductors & AC Generator