WAEC Physics Past Questions & Answers - Page 263

1,312.

Calculate the quantity charge flowing through a conductor if a current of 10A passes through the conductor for 10s.

A.

100C

B.

20C

C.

15C

D.

10C

E.

1C

Correct answer is A

No explanation has been provided for this answer.

1,313.

The effective capacitance between points X and Y in the diagram below is 1.0μF, What is the value of the capacitance C, measured in micro-farad?

A.

5.0μF

B.

4.0μF

C.

3.0μF

D.

1.0μF

E.

0.5μF

Correct answer is D

No explanation has been provided for this answer.

1,314.

The energy stored in a capacitor of capacitance 5μF is 40J. Calculate the voltage applied across its terminals?

A.

4000V

B.

200V

C.

16V

D.

6V

E.

4V

Correct answer is A

\(E = \frac{CV^{2}}{2}\)

\(V^{2} = \frac{2E}{C}\)

\(V^{2} = \frac{2\times 40}{5 \times 10^{-6}}\)

\(V^{2} = 16 \times 10^{6}\)

\(V = 4 \times 10^{3} = 4000v\)

1,315.

A capacitor of capacitance 25μF is connected to an a.c. power source of frequency 200 Hz. Calculate the reactance of the capacitor

A.

0.01

B.

0.02

C.

50.00

D.

100.00

E.

200.00

Correct answer is D

No explanation has been provided for this answer.