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676

The electric force between two point charges each of the magnitude, q at a distance of r apart in air of permittivity is:

  • A. q2/4πεr
  • B. rε0/q2
  • C. 4πq/ε0
  • D. qr2/ε0
  • E. \(\frac{q^2}{4\piεor^2}\)
View Answer & Discuss (5) WAEC 1989
677
Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?
  • A. metre rule
  • B. A pair of callipers
  • C. A micrometer screw gauge
  • D. A tape rule
  • E. A set square
View Answer & Discuss WAEC 1990
678
A particle of mass 2.5 x 10-6kg revolving around the earth has a radial acceleration of 4 X 107 ms-2. What is the centripetal force of the particles?
  • A. 6.25 x 10-14N
  • B. 1.60 x10-13N
  • C. 5.00 x 10N
  • D. 1.00x102N
  • E. 2.00x1O2N
View Answer & Discuss (5) WAEC 1990
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679
An oscillating pendulum has a velocity of 2ms-1 at the equilibrium position O and velocity at same point P. Using the diagram above, calculate the height of P above O. (Take g = 10ms2)
  • A. 5.0m
  • B. 2.0m
  • C. 0.4m
  • D. 0.2m
  • E. 0.1m
View Answer & Discuss (3) WAEC 1990
680
Which of the following are contact forces? I. Force of tension II. Force of fiction, III. Magnetic force III Force of reaction.
  • A. I,II and III only
  • B. I, II and IV only
  • C. I, III and IV only
  • D. II, III and IV only
  • E. l and IV only.
View Answer & Discuss (3) WAEC 1990
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