Moving Charges and Magnetism

Question: The magnetic field at a distance $r$ from a long wire carrying current $i$ is $0.4$ Tesla. The magnetic field at a distance $2r$ is



1) $0.2 Tesla$
2) $0.8 Tesla$
3) $0.1 Tesla$
4) $1.6 Tesla$
Solution: Explanation: No Explanation
Biot-Savart's Law Amperes Law

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