Question

Some magnetic flux is changed in a coil of resistance $10$ ohm. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in Webers is (Neglect self inductance of the coil)

• A. 2
• B. 4
• C. 6
• D. 8

Answer 1

The correct option is A 2

Change in flux is nothing but $\text{area under i-t graph multiplied by Resistance}$

Area under current time graph shown above is $4\times 0.1/2=0.2$

As the graph is a triangle.

So flux change will be $0.2\times 10=2webers$