Questions
A long straight non-conducting string carries a charge density of 40 mC m-1. It is pulled along its length at a speed of 300 m/sec. What is the magnetic field at a normal distance of 5 mm from the moving string?
detailed solution
Correct option is A
The moving string behaves like a current,i=40×10-6C/m(300 m/sec) =1.2×10-2 ampere Then B=μ0i2πr=2×10-7×1.2×10-20.005 =4.8×10-7 teslaSimilar Questions
Two infinitely long straight parallel wires carry equal currents ‘i’ in the same direction and are 2 m apart. Magnetic induction at a point which is at same normal distance from each wire has magnitude
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