The magnetic flux through a coil changes from `4 xx 10^(-2)` wb to `6 xx 10^(-2)` wb in
0.04 second. Calculate the magnitude of emf induced in the coil.

Explanation

`phi_(1)=4xx10^(-2)"wb"`
`phi_(2)=6xx10^(-2)"wb"`
dt = 0.04 s
Induced emf = e=?
`e = - (phi_(2)-phi_(1))/(dt)`
`=-((6 xx 10^(-2)-4 xx 10^(-2)))/(0.04)`
`= - ((6-4)xx 10^(-2))/(0.04)`
`= - (2)/(0.04)xx 10^(-2)`
`= - (1)/(0.02)xx 10 ^(-2)`
`implies e" "= - 0.5 ` volt