Nuclei — Physics STD 12 Science — Question

Draw logic symbol of an OR gate and write its truth table.

How should a magnetic dipole be placed in a uniform magnetic field so that its potential energy is maximum?

A long straight current carrying wire passes normally through the centre of circular loop. If the current through the wire increases, will there be an induced emf in the loop? Justify.

An AC source is connected to a capacitor. Will the rms current increase, decrease or remain constant if a dielectric slab is inserted into the capacitor?

With increase in temperature, will the drift velocity of free electrons in a metallic conductor increase or decrease?

Is work done by a battery always equal to the thermal energy developed in electrical circuit? What happens if a capacitor is connected in the circuit?

Answer the following questions:
The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism. Why?

The potential on any two parallel surfaces is equal. The distance between them is r. If a charge is moved from one surface to another, what will be the work done in this situation?