Question

Statement I The flux can be altered by changing the shape of a coil in a magnetic field or rotating coil in a magnetic field such that the angle $\theta$ between $B$ and $A$ changes.
Statement II By changing the shape of a coil or the angle $\theta$ between $B$ and $A$, an emf is induced in the coil.

• A. Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.
• B. Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I.
• C. Statement I is correct but Statement II is incorrect.
• D. Statement I is incorrect but Statement II is correct.

Answer 1

Answer: (A)

If $B=0$, then $\phi=B \cdot A=0$.
If $\phi=0$, then $\phi=B \cdot A=0 . B$ may or may not be zero because angle between $B$ and $A$ may be $90^{\circ} . B A \cos \theta=0$ for $\theta=90^{\circ}$.