Figure shows three cases: in all case the circular part has radius r and straight ones are infinitely long. For the same current the ratio of field B at centre P in the three case `B_1:B_2:B_3` is

The diagram shows three cases. In all the three cases the circular part has radius r and straight ones are infinitely long. For the same current, I find bar(B) at the centre P.

The figure shows three long straight current carrying conductors. The straight parts are long and the circular part in each case in ((3)/(4))^(th) of a complete circle, Let B_(a), B_(b) and B_(c) represents the strength of field at the centre O in the three cases, then

The figure shows three long straight current carrying conductors. The straight parts are long and the circular part in each case in ((3)/(4))^(th) of a complete circle, Let B_(a), B_(b) and B_(c) represents the strength of field at the centre O in the three cases, then

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

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—