Neco Model Questions Vol1 2025 Physics Question 29

A rectangular conducting loop of width \(0.10\ \text{m}\) and length \(0.20\ \text{m}\) lies in a uniform magnetic field of magnitude \(0.80\ \text{T}\) directed into the page. The loop has a resistance of \(5.0\ \Omega\). The loop is pulled out of the field at a constant speed, with the side of length \(0.20\ \text{m}\) exiting first. While the loop is partially out of the field, a steady induced current of \(0.12\ \text{A}\) flows. (a) Determine the speed of the loop in \(\text{m\,s}^{-1}\). (b) Calculate the magnitude of the magnetic force acting on the moving side of length \(0.20\ \text{m}\) during the motion, and state whether it opposes or assists the motion. (c) Find the total electrical energy dissipated in the resistor from the moment the loop starts to leave the field until it is completely out of the field. Give your answers to two significant figures.