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4. The drawing below shows a plot of the output emf of a generator as a function of time t. The coil of this device has a cross-secontal area per turn of 0.040 m2 and contains 136 turns. Find
a. the frequency of the generator in Herz
b. the angular speed in rad/s
c. the magnitude of the magnetic field
d. if a step-up transfomer is connected with the generator, the voltage in the secondary coil is 300 V. What is the turn ratio of the transformer?

5. A resistor has a resistance R, and a battery has an internal resistance r. When the resistor is connected across teh battery, 8% less power is dissipated in R than there would be if the battery had no internal resistance. FInd the ratio r/R.

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The output emf of a generator is investigated. Futhermore, it calculates the power output of a battery with internal resistance.
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4. A. From the drawing, the period T=0.84s. So the frequency is
B. ...

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