Physics Moving Charges and Magnetism Biot-Savart Law

The magnetic field induction at a point 4 cm from a long current-carrying wire is 10^-3T. The magnetic field induction at a distance of 2 cm from the same current-carrying wire will be:

1

2 x 10^-4 T

2

2 x 10^-3 T

3

3 x 10^-3 T

4

4 x 10^-3 T

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