Why the oscillations of a copper disc in a magnetic field are highly damped?

What is a neutral point in a magnetic field of a bar magnet.

What is the function of the radial magnetic field of the magnet?

A vibration magnetometer consists of two identical bar magnets, placed one over the other, such that they are mutually perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is 4 second. If one of the magnets is taken away, find the period of oscillation of the other in the same field.

Current loop does not tend to rotate when its plane is bot to the direction of magnetic field. Why?

Is the direction of magnetic force exerted by a magnetic field on a moving charge the same as that of magnetic field?

A current is set up a long copper pipe. Is there a magnetic field inside the pipe?

A current is set up in a long copper pipe. Is there a magnetic field outside the pipe?

A bar magnet is oscillating in the earth's magnetic field with a time period T. If the mass is quadrupled, then its time period will be: