Electromagnetic Induction — Physics STD 12 Science — Question

Explain ground state and ionisation energy of hydrogen atom.

One person says that the potential energy of a particular book kept in an almirah is 20J and the other says it is 30J. Is one of them necessarily wrong?

When an ideal capacitor is charged by a dc battery, no current flows. However, when an ac source is used, the current flows continuously. How does one explain this, based on the concept of displacement current?

Why is exposure to X-rays injurious to health but not exposure to visible light, when both are electromagnetic waves?

A small disc is set rolling with a speed v on the horizontal part of the track of the previous problem from right to left. To what height will it climb up the curved part?

A metre scale is graduated at every millimetre. How many significant digits will be there in a length measurement with this scale?

Can two states of an ideal gas be connected by an isothermal process as well as an adiabatic process?

Write limitations of Ohm's law.

A spy jumps from an airplane with his parachute. The spy accelerates downward for some time when the parachute opens. The acceleration is suddenly checked and the spy slowly falls on the ground. Explain the action of parachute in checking the acceleration.