A copper rod AB of length l is made to move with constant velocity v→ in a uniform magnetic field of induction B→ as shown in the figure. Then
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a
end A will acquire positive polarity and end B will acquire negative polarity.
b
ends A and B of the rod will acquire positive polarity and mid point C will acquire negative polarity.
c
ends A and B of the rod will acquire negative polarity and mid point C will acquire positive polarity.
d
end A will acquire negative polarity and end B will acquire positive polarity.
answer is A.
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Detailed Solution
Magnetic force on each free electron in the rod Fe→=(-e) v→ x B→ which is directed from A to B. As a result free electrons will move towards end B. Hence end A becomes positively charged and end B becomes negatively charged.