Answer:
(a) Using ,
we get
The
electrons in the rod will experience force along PQ, so end P becomes positive
and Q becomes negative.
(b)
Yes. On closing the key K the number of electrons become more at end O.
Therefore, excess charge is maintained by the continuous current.
(c)
Magnetic force gets cancelled by electric force due to excess charges of
opposite sign at the ends of the rod.
(d)
Retarding force,
(e)
Power,
When
K is open no power is spent.
(f)
Power lost
The
source of this power is the external agency.
(g)
Zero, because motion of rod does not cut or link with field lines.
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