placed
in a uniform magnetic field 
perpendicular
to its length. Consider the charges inside the wire. It is known that magnetic
forces do not work. This implies that
(a) motion
of charges inside the conductor is unaffected by since
they do not absorb energy
(b)
Some charges inside the wire move to the surface as a result of
(c)
if the wire moves under the influence of ,
no work is done by the force
(d)
if the wire moves under the influence of ,
no work is done by the magnetic force on the ions, assumed fixed within the
wire
Answer:
(b,d)(a) Motion of
charges inside the conductor is affected by magnetic field 
, due to magnetic force 
given by 
(b) Due to
magnetic force, some charges inside the wire move to the surface of
wire. (c) The force on wire of length 
,
carrying current 
when subjected to
magnetic field is, = 
.
It
acts perpendicular to the plane containing 
and
and is directed as given by
Right Hand rule. If the wire moves under the influence of at an angle 
, where 
90°, then work done, W = Fs
cos , can not be zero.
(d)
When wire moves under the influence of ,
then displacement of the ions is perpendicular to the magnetic force . Therefore work done is
zero.
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