- #1

anonymous613

I am unable to answer the following questions. I know what the answers are (5 - b, 10 - b, 12 - c), but I do not know how those answers are explained. I am also unable to find any relationships in my textbook that explain the relationships expressed in these questions:

5. As the frequency ina simple ac circuit consisting of an alternating emf and a resistor increases, the rms current through the resistor (a)increases. (b) does not change. (c) may increase or decrease depending on the magnitude of the original frequency. (d) may increase or decrease depending on the magnitude of the resistance. (e) decreases.

ANSWER: (b) How?

10 ∙ If the frequency in the circuit shown in Figure 31-27 (consits of an AC emf connected to an inductor) is doubled, the inductance of the inductor will (a) increase by a factor of 2. (b) not change. (c) decrease by a factor of 2. (d) increase by a factor of 4. (e)

decrease by a factor of 4.

ANSWER: (b) How?

If the frequency in the circuit in Figure 31-28 (consists of an alternating emf connected to a capacitor) is doubled, the capacitative reactance of the circuit will (a)

increase by a factor of 2. (b) not change. (c) decrease by a factor of 2. (d) increase by a factor of 4. (e)

decrease by a factor of 4.

ANSWER: (c) How?

Thanks a lot for your help,

A