A circular wire fo radius 'R' carries a current 'i'. What will be the magnetic field at its centre?
μ0i4R
μ0iR
μ0i2R
μ0i2πR
Solution is in the next video.
A circular loop of radius r carries a current i. How should a long, straight wire carrying a current, 4i be placed in the plane of the circle so that the magnetic field at the centre becomes zero ?