Question

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:

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

Answer 1

The correct option is A 250 Wb

Emf$=\frac{changeinflux}{time}$

Change in flux $=$ Emf $\times$ time

$\int Vdt=\frac{1}{2}({10}^3\times 0.5)=250\Delta \varphi =250Wb$