The strength of the magnetic field at a point `r` near a long straight current carrying wire is `B`. The field at a distance `r/2` will be

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 strength of the magnetic field around a long straight current carrying conductor :

The strength of the magnetic field inside a long current-carrying straight solenoid is

The magnetic field at a distance r from a long wire carryimg current I is 0.4 T. The magnetic field at a distance 2r is

The magnetic field at a distance r from a long wire carryimg current I is 0.4 T. The magnetic field at a distance 2r is

The magnetic field at a distance r from a long wire carryimg current I is 0.4 T. The magnetic field at a distance 2r is