Question

Use biot sartarts law to derive the expression of magnetic field

Answer 1

to find the magnetic field due to a current carrying wire is given by biot-savart's law according to this law

DB is directly proportional to I -(1)

DB is directly proportional to DL -(2)

DB is directly proportional to sin theta

DB is directly proportional to 1/r^2

DB is directly proportional to Idlsintheta/r^2

dB =kI dLsintheta/r^2
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