Magnetic field at a distance 'a' from long current carrying wire is proportional to -

The magnetic field at a distance 'a' from along wire carrying current 'I' is 0.4 tau . The magnetic field at a distance '2a' is __________ .

Represent graphically the variation of magnetic field with distance from a long current carrying wire.

The strength of the magnetic field at a point distance 10 cm from a long straight current carrying wire is B . The field at a distance 5 cm will be :

The magnetic field at a distance 10 cm from a long straight current carrying conductor is 0.8T. The magnetic field at a distance 40 cm is

The magnetic field at a distance r from a long wire carrying current is 0.6 tesla. The magnetic field at a distance 2r is

Choose the correct option:- The magnetic field at a distance 'r' from long wire carrying a current is 0.8T. The magnetic field a distance 2r is