Question

write an expression for magnetic field at a
conductor carrying current.
(6) A straight conductor carrying a current of 20A.find
the magnetic field at point 5cm from it.
​

Answer 1

Explanation:

Magnetic induction due to infinitely long straight conductor carrying current: XY, is an infinitely long straight conductor carrying a current I(Figure).

P is a point at a distance a from the conductor. AB is a small element of length dl. θ is the angle between the current element Idl and the line joining the element dl and the point P. According to Biot-Savart law, the magnetic induction at the point P due to the current element Idl is.