A metallic block carrying current i is subjected to a uniform magnetic induction B as shown in the figure. The moving charges experience a force F given by ……. which results in the lowering of the potential of the face ……. Assume the speed of the carriers to be 
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As the block is of metal, the charge carriers are electrons; so for current along positive 
-axis, the electrons are moving along negative 
-axis, i.e. vector 
and as the magnetic field is along the 
-axis, i.e.
so 
for this case yield
As force on electrons is towards the face 
, the electrons will accumulate on it an hence it will acquire lower potential.
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