The values of `i` so that magnetic field at `R` is zero

A circular loop of radius r carries a current i .How should a long, straight wire carrying a current 3i be placed in the plane of the circle so that the magnetic field at the centre of the loop becomes zero?

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 center becomes zero?

A circular loop of radius r carries a current i. where 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?

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?

A circular loop of radius r carries a current i. where 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?

The vertical component of earth's magnetic field is zero at or The earth's magnetic field always has a vertical component except at the

A cylindrical conductor of radius 'R' carries a current 'i' . The value of magnetic field at a point which is R//4 distance inside from the surface is 10 T . Find the value of magnetic field at point which is 4R distance outside from the surface