Spectrum — Physics STD 10 — Question

A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.

When will coil come to rest?

State expression for Resistance connected in parallel.

Why is it more difficult to move a magnet into the coil which has large number of turns?

Define the term dispersion of light.

In which of the following case does the electromagnetic induction occur?

A current is started in a wire held near a loop of wire ?

Is it easier to turn a steering wheel of large diameter than that of small diameter? Why?

Infrared radiations are used as signals during war

A mixture of radioactive substance gives off three types of radiation name the radiation which has the maximum penetrating power.

How does (a) resistance, and (b) specific resistance of a wire depend on its (i) length, and (ii) radius?