{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

10_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

# 10_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

This preview shows page 1. Sign up to view the full content.

184 CHAPTER 20 20.22 During each revolution, one of the rotor blades sweeps out a horizontal circular area of radius A , 2 A π = A vertica B A B = . The number of magnetic field lines cut per revolution is . The induced emf is then B l A ∆Φ = ( ) ( ) ( ) 2 5 2 3 5.0 10 T 3.0 m 2.8 10 V 2.8 mV 1 0.50 s ertical t f π π × = = × = A v B B ε ∆Φ = = 20.23 (a) To oppose the motion of the magnet, the magnetic field generated by the induced current should be directed to the right along the axis of the coil. The current must then be left to right through the resistor. (b) The magnetic field produced by the current should be directed to the left along the axis of the coil, so the current must be right to left through the resistor. 20.24 (a) As the bottom conductor of the loop falls, it cuts across the magnetic field lines coming out of the page. This induces an emf of magnitude Bwv = E in this conductor, with the left end at the higher potential. As a result, an induced current of magnitude Bwv I R R =
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online