alleryStart learning →The Biot-Savart law gives the field of a current element as varying with distance r as:
A1/r^3
B1/r
Cr^2
D1/r^2
Answer & Solution
Correct answer: D. 1/r^2
The magnitude of dB is proportional to Idl sin(theta)/r^2, so it is an inverse square law in r.
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