Magnetic Forces, Materials, and Devices - Questions With Answers (Short Notes)
01. State Three Ways In Which Forces Due To Magnetic Fields Can Be Experienced? Answer: There are at least three ways in which force due to magnetic fields can be experienced. The force can be due to a moving charged particle in a magnetic field. on a current element in an external magnetic field. between two current elements. 02. State The Lorentz Force Equation? Answer: The Lorentz force equation relates the force acting on a particle with charge Q in the presence of EM fields. It expresses the fundamental law relating EM to mechanics. F = Q(E + u * B) = m ( du/dt) Based on the Lorentz force law, the force experienced by a current element Idl in a magnetic field B is dF = I dl * B From this, the magnetic field B is defined as the force per unit current element. 03. Define Magnetic Torque? Answer: The torque T (or mechanical moment of force) on the loop is the vector product of the force F and iho moment arm r. T = r X F and magnetic torque is meas...