$A$ metallic ring connected to a rod oscillates freely like a pendulum. If a magnetic field is applied in the horizontal direction such that the pendulum swings through the field,the pendulum will:

What should be the resistivity of materials used for electromagnets,and why?

The working of magnetic braking of trains is based on

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $A$ bar magnet dropped through a metallic cylindrical pipe takes more time to come down compared to a non-magnetic bar with same geometry and mass.
Reason $R$: For the magnetic bar,Eddy currents are produced in the metallic pipe which oppose the motion of the magnetic bar.
In the light of the above statements,choose the correct answer from the options given below:

Eddy currents are produced when

$A$ spherical insulating ball and a spherical metallic ball of the same size and mass are dropped from the same height. Choose the correct statement out of the following (Assume negligible air friction).