Answer:
In Fig. 4(EP). 11, we
have shown a wire AB of length = d,
resistance R moving with a velocity along positive
direction of X-axis over two parallel wires OX and CD at y = 0 and y = d
respectively.
The
magnetic field covering the region is
At
t = 0, AB is at = 0 and velocity
=
At
t = t, AB is at = t
Motional
emf in AB =
Its
direction, as per Fleming's right hand rule is along negative y-axis.
e.m.f.
due to change in magnetic field =
It
is also along negative y-axis.
total e.m.f. induced =
Current
induced,
The
direction of current is clockwise, i.e., along ABOC (absorbing negative sign).
Force needed along ; F =
F =
F =
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