Physics - Modern Physics Question with Solution | TestHub

(A) Earth is moving around sun. A is point on its orbit closest to sun and B is point on its orbit farthest from sun.

(P) Potential energy at A is more than potential energy at B.

(B) A ring carrying uniform current i is kept freely inside a solenoid such that its diameter is along axis of solenoid. This is configuration A. When it is released, it rotates so that their axes coincide. This is configuration B.

(Q) Potential energy at A is less than potential energy at B.

(C) A $\to$ Assume that an electron is in ground state of Hydrogen atom. B $\to$ It gets excited to first excited state after a photon strikes it.

(R) Kinetic energy at A is more than kinetic energy at B.

(D) Wooden cube of side 10 cm and density $500kg/{\mathrm{m}}^3$ is held just above water surface $\to$ A. It is now released. Block has moved down by a distance of 5 cm $\to$ B. Neglect viscosity.

(S) Kinetic energy at A is less than kinetic energy at B.

(T) Total mechanical energy at A = total mechanical energy at B.