Questions
A flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicularly to the plane of the coil. The radius of the coil changes as shown in figure.
The graph of magnitude of induced emf in the coil is represented by
detailed solution
Correct option is B
In the r-t graph, it is clear that from a to b there is no change in radius and hence no change in area and magnetic flux. Same is the situation from c to d.Now,|ε|=ddt(ϕ)For b to c,⇒|ε|=Bddtπr2=Bπ2rdrdt Since r∝t, ∴ drdt= constant ∴ |ε|∝rTalk to our academic expert!
Similar Questions
A square wire loop, of side a has a long straight wire carrying a constant current i that passes through the centre of the loop and perpendicular to its plane as shown in Fig.
The current induced in the square loop is
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