NEET 2013 Physics question

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

(1)once per revolution
(2)twice per revolutionCorrect
(3)four times per revolution
(4)six times per revolution

Answer: (2)

Solution

For a loop of turns and area rotating with angular speed in a field , the flux is and the induced emf is . This is a sine function of time that reverses its sign (changes direction) every half

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-091325