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A copper rod AB of length l is made to move with constant velocity $\vec{v}$ in a uniform magnetic field of induction $\vec{B}$ as shown in the figure. Then

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end A will acquire positive polarity and end B will acquire negative polarity.

ends A and B of the rod will acquire positive polarity and mid point C will acquire negative polarity.

ends A and B of the rod will acquire negative polarity and mid point C will acquire positive polarity.

end A will acquire negative polarity and end B will acquire positive polarity.

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detailed solution

Correct option is A

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.

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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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Ready to Test Your Skills?

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A copper rod AB of length l is made to move with constant velocity $\vec{v}$ in a uniform magnetic field of induction $\vec{B}$ as shown in the figure. Then