Scenario #4 7) (3 points) The primary coil of an ideal transfor applied to the p

Question

Scenario #4 7) (3 points) The primary coil of an ideal transfor applied to the primary coil is 120 V, what voltage is present in its mer has 100 turns and its secondary coil has 400 turns. If the ac voltage A) 100 v B) 30 v C) 70 v D) 480 v 8) (3 points) An AC source is connected to a variable capacitor. If the capacitance i s increased, the current A) Increases. B) Decreases C) Does not change. D) Chicken Short Answer (6 points) Resistance R The figure shows a conducting rod that slides along metal rails. Assume the resistance of the rails is negligible and the resistance of the rail is 75 ?. At the instant shown, 20 cm, x 20 cm, v = 45 cm/s and B 10 T. ' × XX a) What is the magnetic flux through the conducting loop at the instant shown? xxx b) What is the magnitude of the current at the instant shown?X c) Is the current clockwise or counter clockwise? ?????

Explanation / Answer

7.

In Transformers, we know that

Np/Ns = Vp/Vs

Np = number of primary coil = 100

Ns = number of secondary coil = 400

Vp = Voltage in primary coil = 120 V

Vs = ?

Vs = Vp*(Ns/Np)

Using given values:

Vs = 120*(400/100) = 480 V

Correct option is D.

8.

in AC source

i = V/Z

Z = Xc, for a variable capacitor circuit

Xc = 1/(w*C)

So if C is increased then Xc will decrease, which means Z will decrease

Since i = V/Z

Z is decreasing, So current will increase.

Correct option is A.

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