In a coil of resistance 100 `Omega` , a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is ……..

Options

A. 250 Wb
B. 275 Wb
C. 200 Wb
D. 225 Wb

Answer

A

Explanation

`epsilon=(Deltaphi)/(Deltat)`
`therefore IR=(Deltaphi)/(Deltat)`
`therefore Deltaphi=IR Deltat`
`=R (I Deltat)`
`=R xx ("Area of graph" I to t)`
`=100xx1/2 xx0.5xx10`
=250 Wb