"A soft iron core in solenoid acts as an electromagnet". Explain.

"The light waves are transverse electromagnetic waves".Explain.

Explain how rusting of iron is envisaged as setting up of an electrochemical cell.

Corrosion is essentially an electro chemical phenomenon. Explain the reactions occurring during corrosion of iron kept in an open atmosphere.

Deduce an expression for the self inductance of a long solenoid, the core of which consists of a magnetic material of permiability mu_r

Explain why: n optical pyrometer (for measuring high temperatures) calibrated for an ideal black body radiation gives too low a value for the temperature of a red hot iron piece in the open, but gives a correct value for the temperature when the same piece is in the furnace