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

Answer 1

The correct option is A $250Wb$

Given,

$R=100\Omega$

The flux impedance relation is given by

Charge $\Delta q=\frac{\Delta \varphi }{R}$

$\Delta \varphi =R\int Idt$

$\Delta \varphi =R\times areaofcurrent-timegraph$ (from given graph)

$\Delta \varphi =100\times \frac{1}{2}\times 10\times 0.5$

$\Delta \varphi =250Wb$

The correct option is A.