A radioactive nucleus emits a beta particle. Its mass number MCQ with Answer and Explanation

Explanation:
The power formula is P = VI, where P is power, V is voltage, and I is current. Rearranging for current gives I = P / V. Given P = 1500 W and V = 220 V, the current I = 1500 / 220 ≈ 6.818 Amperes. Thus, 6.8 A is the closest correct answer.

Explanation:
Induction (changing flux ⇒ EMF): generators (motion ⇒ electricity), transformers (AC voltage conversion). Motors use reverse principle (force on current in field). Memory aid: 'Induction: generators, transformers; motors: Lorentz force'. Device principle frequently tested in competitive electromagnetism sections.

Explanation:
Objects float if their density is less than the fluid. Cork density < water density, so it floats. Iron sinks because density > water. Ship made of iron floats due to shape displacing more water, average density less.