The device used for detecting and measuring small electric current is MCQ with Answer and Explanation

Explanation:
36 km/h = 10 m/s. a = (0-10)/2 = -5 m/s², magnitude 5 m/s².

Explanation:
Work = F s cosθ. Energy is capacity to do work. Power is rate of work. Momentum = m v. Work and energy have same unit joule.

Explanation:
Motor: current-carrying conductor in magnetic field experiences Lorentz force (F = ILB), causing rotation. Generator uses reverse principle (induction). Memory tip: 'Motor: electricity ⇒ motion (force); Generator: motion ⇒ electricity (induction)'. Device principle question frequently tested in competitive electromagnetism sections.