Question

which one is incorrect ? A The magnetic field inside along straight solenoid carrying current is nearly uniform B The pattern of magnetic field lines of current carrying solenoid is same as that of bar magnet C Magnetic field lines due to a straight current carrying wire are in the form of concentric circles D.Electric motor has slip rings connected to the ends of thecoils​

Answer 1

Explanation:

magnetic needle placed in uniform

magnetic field has magnetic moment of

2 x 10-2 A m², and moment of inertia of

7.2 x 10-7 kg m². It performs 10 complete

oscillations in 6 s. What is the magnitude

of the magnetic field ?