A device that converts light energy into electrical energy is MCQ with Answer and Explanation

Explanation:
A potentiometer uses a long wire of uniform cross-section and composition. When a constant steady current flows through it, Ohm's law (V = IR) and the resistance formula (R = rhoL/A) combine to give V = I(rho/A)L. Since I, rho, and A are constant, the potential drop V is strictly directly proportional to the length L of the wire.

Explanation:
R ∝ L/A ∝ 1/d². So R₁/R₂ = (d₂/d₁)² = (1/2)² = 1/4 = 1:4.

Explanation:
Isaac Newton formulated three laws of motion and law of universal gravitation in Principia (1687). He also contributed to calculus, optics. Galileo experiments on motion. Einstein relativity.