Question

A coil of 25 turns is pulled in 0.05 s between the poles of a magnet, where its area includes `21 xx106-6 "Wb"  "to" 1 xx 10^-6  "Wb"`. The average e.m.f. is ______.

पर्याय

• `10^-2 "V"`

• `10^-3 "V"`

• zero

• `10^-4 "V"`

Answer 1

A coil of 25 turns is pulled in 0.05 s between the poles of a magnet, where its area includes `21 xx106-6 "Wb"  "to" 1 xx 10^-6  "Wb"`. The average e.m.f. is `10^-2 "V"`.

Explanation:

e = `(-"n"(phi_2 - phi_1))/"t"`

= `(-25(1 xx 10^-6 -21 xx 10-^6))/0.05`

=`10^-2 ` V