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  4. Two concentric circular coils A and B have radii 25 cm and 15 cm and carry currents 10A and 15A respectively. A has 24 turns, and B has 18 turns. The direction of currents are in opposite order. The magnetic induction at the common centre of the codlis

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Q. Two concentric circular coils A and B have radii 25 cm and 15 cm and carry currents 10A and 15A respectively. A has 24 turns, and B has 18 turns. The direction of currents are in opposite order. The magnetic induction at the common centre of the codlis

Moving Charges and Magnetism

Solution:

$B=B_1-B_2$