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

Here, `R = 100 Omega`
As `q = int I dt` = area of current time graph
`q = (1)/(2) xx 10 xx 0.5 = 2.5 C`
From `q = (Delta phi)/(R )`
`Delta phi = q xx R = 2.5 xx 100`
`= 250 Wb`