5. In the RC circuit shown below, what may be said about the circuit after the s

Question

5. In the RC circuit shown below, what may be said about the circuit after the switch has been closed for a very long time? a. There are no free electric charges in the battery b. The battery still provides a potential difference c. The electric field in the wire is zero. d· The capacitor acts as a short circuit. e. The resistor still creates a drop in potential. C, 6, A resistor of unknown resistance and a 15 resistor are connected across a source of a 20 V EMF in such a way that 2.0 A of current is observed. What is the value of the unknown resistance? a. 5 b, 1012 c. 15 d. 30 7. A 1/4-wavelength radio antenna needs to transmit 1200 kHz radio waves. What should the height of the antenna be? a. 0.016 m b. 15.6 nm c. 62.5 nm d. 250 nm 8. A loop of wire is moving in a uniform magnetic field as shown below. In which direction is the current flowing in the wire? a. Down b. No current d. Counter-clockwise

Explanation / Answer

5. After a long time capacitor become fully charged it will act as open circuit . Then the electric field in wire become zero .

Option C is correct

6. 30 Ohm

7.Wavelength of quater wavelength antena for frequency 1200kHz = 62.5

Height of anteena =62.5/4

= 15.6 m

Answer is C.

8. Flux is not changing so no current induced.

Answer is B.

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