JAMB Physics Past Questions & Answers - Page 98

487.

Which of the following statements is correct? When capacitors of different values are connected in series

A.

the same charge flows through them

B.

the same voltage appears across each capacitor

C.

different quantities of charges flow through them in different voltages across them

D.

different quantities of charges flows through them with the same voltage across them

Correct answer is A

No explanation has been provided for this answer.

488.

An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20\(\Omega\). Calculate the power loss in the cable.

A.

120 w

B.

360 w

C.

720 w

D.

2400 w

Correct answer is C

Power - IV

I = \(\frac{P}{V}\)

= \(\frac{12000}{2000}\)

I = 6A

Power loss = I\(^2\)R = 6\(^2\) x 20

= 720 W

490.

The diagram given illustrates two charged particles W and X. The charges on W and x are respectively

A.

negative; negative

B.

negative; positive

C.

positive; positive

D.

positive; negative

Correct answer is A

No explanation has been provided for this answer.