MHT CET 2026 Physics question

Physics Moving Charges and Magnetism MHT CET 2026

The magnetic field at a distance 'r' from a long straight wire carrying current I is 0.4 tesla. The magnetic field at a distance 2r will be

(A)0.1 tesla
(B)0.2 teslaCorrect
(C)0.8 tesla
(D)1.6 tesla

Answer: (B)

Solution

For a long straight current-carrying wire, , so . Doubling the distance halves the field: tesla, option

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Question ID VK-099941