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1271

The force of repulsion between two point positive charges 5\(\mu\)C and 8\(\mu\)C separated at a distance of 0.02m apart is. [\(\frac{1}{4{\pi}{\varepsilon}_o}\) = 9 x 10\(^9\)Nm\(^2\)C\(^{-2}\)]

  • A. 1.8 x 10-10N
  • B. 9.0 x 10-8N
  • C. 9.0 x 102N
  • D. 4.5 x 103N
View Answer & Discuss (15) JAMB 1998
1272
An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because
  • A. ebonite has a negative charge while glass has a positive charge
  • B. ebonite has a positive charge while glass has a negative charge
  • C. both have negative charges
  • D. both have positive charges
View Answer & Discuss (1) JAMB 1998
1273
Which of the following can be used to reduce local action in a Laclanche cell?
  • A. A carbon rod as the positive pole
  • B. Pure zinc as the negative pole
  • C. Potassium permanganate solution in contact with the positive pole
  • D. common salt solution
View Answer & Discuss (14) JAMB 1998
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1274
Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts
  • A. 50J
  • B. 100J
  • C. 200J
  • D. 400J
View Answer & Discuss (3) JAMB 1998
1275

A parallel plate capacitor has a common plate area of 5 x 10\(^{-8}\)m2 and plate separation of 2 x 10\(^{-3}\)m, Assuming free space,

What is the capacitance? [\(\varepsilon\)o = 9.0 X 10-\(^{-12}\)C2N-1m-2]

  • A. 2.25 x 10-17F
  • B. 4.50 x 10-17F
  • C. 2.25 x 10-16F
  • D. 4.50 x 10-16F
View Answer & Discuss (17) JAMB 1998
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