A current I enters a uniform circular coil of radius R, branches into two parts and then recombines as shown in the circuit diagram. The resultant magnetic field at the centre of the coil is :

A circular coil 'A' has a radius R and the current flowing through it is I. Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of

A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of

A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of

A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 21is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of

A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 21is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of

An infinite straight current carrying conductor is bent into a circle as shown in the figure . If the radius of the circle is R , the magnetic field at the centre of the coil is :

A circular coil A is of radius R and current I, another circular coil 'B’ is of radius 2R and current 2I.The ratio of magnetic field B_A : B_B at their centre is—

A circular coil of radius R carries an electric current i. The magnetic field at a point on the axis at a distance x from the centre of the coil (xgtgtR) varies as