Some magnetic flux is changed from a coil of resistance `10Omega` . As a result an induced current is developed in it, which varies with time as shown in figure. What is the magnitude of change in flux through the coil ?

Explanation

The induced charge is `q=(Delta phi)/(R)`
But , Area of i-t curve gives charge
`:. Delta phi=R xx "Area of i-t curve"`
`Delta phi =qR =(1)/(2) xx 4 xx 0.1 xx 10`
`:. Delta phi =2` wb