Physics Past Questions

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1391

When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because

A. both the pen and the cloth are magnetized
B. the pen is magnetized but the cloth is not
C. the pen is charged while the cloth is magnetized
D. both the pen and the cloth are charged

View Answer & Discuss (3) JAMB 1994

1392

A capacitor 8\(\mu\)F is charged to a potential difference of 100V. The energy stored by the capacitor is

A. 1.0 x 10⁴J
B. 8.0 x 10J
C. 1.25 x 10J
D. 4.0 x 10^-2J

View Answer & Discuss JAMB 1994

1393

Two capacitors R₁ = 4\(\Omega\) and R₂ = 5\(\Omega\) are connected in parallel across a potential difference. If P₁ and P₂ represent power dissipated in R ₁ and R₂ respectively, then the ratio P₁ : P₂ is

A. 4 : 5
B. 5 : 4
C. 16 : 25
D. 25 : 16

View Answer & Discuss (4) JAMB 1994

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1394

Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks