Electromagnetic Waves — Physics STD 12 Science — Question

Two proton beams going in the same direction repel each other whereas two wires carrying currents in the same direction attract each other. Explain.

Using the concept of force between two infinitely long parallel current carrying conductors, define one ampere of current.

Choose the correct alternative from the clues given at the end of the each statement:
An atom has a nearly continuous mass distribution in a .......... but has a highly non-uniform mass distribution in .......... (Thomson’s model/ Rutherford’s model.)

What is the specialty of sunglasses made from polaroid instead of ordinary glass?

Under what condition does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a liquid?

Why should the spring/suspension wire in a moving coil galvanometer have low torsional constant?

Define the term self-inductance of a solenoid. Obtain the expression for the magnetic energy stored in an inductor of self-inductance L to build up a current I through it.