If the momentum of a body is increased by 100%, its kinetic energy increases by MCQ with Answer and Explanation

Explanation:
According to Coulomb's Law, the electrostatic force (F) between two point charges is inversely proportional to the square of the distance (r) between them (F ∝ 1/r²). If the distance is doubled (r becomes 2r), the new force F' ∝ 1/(2r)² = 1/4r². Thus, the force becomes one-fourth of its original value.

Explanation:
Hygrometer measures relative humidity. Wet and dry bulb, hair hygrometer. Hydrometer measures liquid density. Anemometer wind speed. Barometer pressure.

Explanation:
A Wheatstone bridge circuit consists of four arms with resistances P, Q, R, S and a galvanometer in the middle. It is balanced when no current flows through the galvanometer arm. This happens exclusively when the potentials at the two ends of the galvanometer are equal, meaning the potential difference across it is exactly zero (P/Q = R/S).