In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is If the magnitude of magnetic moment of the needle is then the value of ‘x’ is

Which of the following rules is used to determine the direction of the force on a currentcarrying conductor in an electric motor?

Consider the following statements about magnetic field due to a current-carrying solenoid:

(a) The magnetic field inside the solenoid is in the form of parallel straight lines.

(b)The strong magnetic field produced inside the solenoid can be used to magnetise a piece of a magnetic material.
Which of the above statements is/are correct?

Consider the following statements about magnetic field due to a bar magnet:

(a) The field lines inside a bar magnet are directed from its south pole to the north pole.

(b) The magnetic field lines exist only outside the bar magnet.

Which of the above statements is/are correct?

Two coils, A and B, such that A is connected to a battery through a key and B is connected to a galvanometer, are arranged parallel and close to each other. During which of the following duration will the phenomenon of electromagnetic induction be observed?

(a) Two minutes after closing the key.

(b) During the interval the key is taken out.

Consider the following statements about magnetic field due to a current-carrying solenoid:

(a) The magnetic field is uniform inside the solenoid.

(b) One end of the solenoid behaves like the north pole and the other like the south pole of a bar magnet.

Which of the above statements is/are correct?