Question

A magnet is brought towards a coil (i) speedily (ii) slowly then the induced e.m.f.//induced charge will be respectively
A. more in first case/More in first case
B. more in first case/More in first case
C. less in first case/More in second case
D. less in equal case/More in both case

Answer 1

Correct Answer - B
`phi=BA=(mu_(0))/(4pi)(2M)/(x^(3))A`
`e=|(dphi)/(dt)|=(mu_(0))/(4pi)(6M)/(x^(2))(dx)/(dt)A=(mu_(0))/(4pi)(6Mv)/(x^(2))A`
`propv`
`Deltaq=(Deltaphi)/(R)`