Moving Charges ...

A current carrying loop is placed in a uniform magnetic field in four different orientations. Fig Arrange them in the decreasing order of potential energy

An infinitely long straight conductor is bent into the shape as shown in Fig. it carries a current I ampere and radius of the circular loop is a metre. The magnetic field at the centre of the loop is

The magnetic field B at the center of a circular coil of radius r is π times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases: in all cases the circular part has radius r and straight ones are infinitely long. For same current the magnetic field B at the centre P in cases I, II, III have the ratio

An equilateral triangle of side length l is formed from a piece of wire of uniform resistance. The current I is fed as shown in the fig. The magnitude of the magnetic field at its centre O is

A long straight wire carrying current I is bent into the shape as shown in the Fig. The circular portion of the wire has radius 10/π m. The centre of this circle is at a distance 1 m from the straight portion of the wire. The magnetic field at the centre O of the circular portion will be equal to (π² = 10)

A square loop ABCD, carrying a current I₂, is placed near and coplanar with a long straight conductor XY carrying a current I₁, as shown in the Fig. The net force on the loop will be

A long, straight wire is turned into a loop of radius 10cm (see figure). If a current of 8 amperes is passed through the loop, then the value of the magnetic field and its direction at the centre C of the loop shall be close to

The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by