In Fig. 29.8, if the angular speed v of the loop is doubled, then the frequency with which the induced current changes direction doubles, and the maximum emf also doubles. Why? Does the torque required to turn the loop change? Explain.

Fig.29.8

Transcribed Image Text:

(a) (b) Loop (seen- end-on) Flux decreasing most rapidly, largest positive emf Flux increasing most rapidly, largest negative emf Flux at its most negative value, emf is zero. Flux at its most Brush E = -dPg/dt positive value, emf is zero. Slip rings E, Vg -Brush