Q)
(chatquestion).... Figure (38-E3) shows a metallic square frame of edge a
in a vertical plane. A uniform magnetic field B exists in
the space in a direction perpendicular to the plane of
the figure. Two boys pull the opposite corners of the
square to deform it into a rhombus. They start pulling
the corners at t = 0 and displace the corners at a uniform
speed u. (a) Find the induced emf in the frame at th
instant when the angles at these corners reduce to 60
(b) Find the induced current in the frame at this instant
if the total resistance of the frame is R. (c) Find the
total charge which flows through a side of the frame by
the time the square is deformed into a straight line.
%3D
Figure 38-E3
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