Question 791:

• JAMB 1994

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

Question 792:

• JAMB 1994

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

Question 793:

• JAMB 1994

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

A. I and ii
B. I and iv
C. Ii and iii
D. Iii and iv

Question 794:

• JAMB 1994

If two parallel conductors carry currents flowing in the same direction, the conducts will

A. Attract each other
B. Repel each other
C. Both move in the same direction
D. Have no effect on each other

Question 795:

• JAMB 1994

A certain radioisotope of \(^{235}_{92}U\) emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are

A. 219 and 87
B. 84 and 223
C. 223 and 87
D. 219 and 81