Moving Charges ...

1 A current flows through an infinitely long straight wire. The magnetic field produced at a point 1 metre away from it is

Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is

A wire in the form of a square of side \'a\' carries a current i. Then the magnetic induction at the centre of the square wire is (Magnetic permeability of free space = μ₀)

Circular loop of a wire and a long straight wire carry currents I_c and I_e, respectively as shown in figure. Assuming that these are placed in the same plane. The magnetic fields will be zero at the centre of the loop when the separation H is

A long straight wire carries a current of π amp. The magnetic field due to it will be 5 × 10^–5 weber/m² at what distance from the wire [ μ₀ = permeability of air]

A long straight wire carrying current of 30 A is placed in an external uniform magnetic field of induction 4 × 10^–4 T. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point 2.0 cm away from the wire is

A coil having N turns carry a current I as shown in the figure. The magnetic field intensity at point P is

Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field by both coils, if the same current is flown

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil for same current will be

The current is flowing in south direction along a power line. The direction of magnetic filed above the power line (neglecting earth\'s field) is