In the figure below, a metal bar moves at a constant velocity in a constant magn
ID: 2180081 • Letter: I
Question
In the figure below, a metal bar moves at a constant velocity in a constant magnetic field. The field is directed into the page, (a) The direction of the induced current is (1) clock-wise, (2) counterclockwise, or (3) there is no induced current Why? If the magnitude of the B-field is 0.55 T, what is the current in the bar? (Neglect resistance in the bar and wires.) What are the magnitude and direction of the force on the bar? What is the power required by the force on the bar?.Explanation / Answer
a) the rod increases the area => the field through coil=> current induced to reduce the field => in clockwise direction using right hand rule. b)area increasing at 1m^2/sec and the field is flux is area*field increasing at 1*0.55T per sec hence the voltage is 0.55V which accounts for 0.055amps. c)the energy spent in driving the current gives the force acting on the wire. The energy spent = 0.03025 Vi. hence the force on the wire is F*2 = 0.03025 => force = 0.015newtons. d)power = 0.03025