A planar loop of wire rotates in a uniform magnetic field. Initially, at , the plane of the loop is perpendicular to the magnetic field. If it rotates with a period of about an axis in its plane then the magnitude of induced emf will be maximum and minimum, respectively at:
Important Questions on Electromagnetic Induction and Alternating Currents
As shown in the above figure, a current carrying straight wire is kept beside a circular loop. Now, find the direction of induced current in the loop if the current in the wire is decreasing:
The north pole of a magnet is brought near a metallic ring as shown in fig. The direction of induced current in the ring will be-
A copper ring having a cut such that it does not form a complete loop is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. Then acceleration of the falling magnet is
Consider the situation shown in the figure. The wire is slide on the fixed rails with a constant velocity. If the wire is replaced by a semicircular wire; the magnitude of the induced current will
A metallic rod of length is tied to a string of length and made to rotate with angular speed on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the e.m.f. induced across the ends of the rod is:
