1. A magnetic field is perpendicular to a 0.0352m x 0.0594m rectangular coil of
ID: 2033651 • Letter: 1
Question
1. A magnetic field is perpendicular to a 0.0352m x 0.0594m rectangular coil of wire that has 119 turns. In a time of 0.0545s, an average emf of magnitude 1.57V is induced in the coil. What is the magnitude of the change in the magnetic field?
2. The figure below shows a copper wire (negligible resistance) bent into a circular shape with a radius of 0.492m.
The radial section BC is fixed in place, while the copper bar AC sweeps around at an angular speed of 13.6rad/s. The bar makes electrical contact with the wire at all times. The wire and the bar have negligible resistance. Assume R = 2.90W (Ohm). A uniform magnetic field exists everywhere, is perpendicular to the plane of the circle, and has a magnitude of 3.86×10-3T. Calculate the magnitude of the current induced in the loop ABC.
B(Into paper) Wire R CExplanation / Answer
Solution :-
emf = N*A*dB/dt
dB = emf*dt/(N*A)
= 1.57*0.0545/(119*0.0352*0.0594)
= 0.2554 T
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