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121
Which of the following pairs of light rays shows the widest separation in the spectrum of white light?
  • A. Yellow and red
  • B. Orange and green
  • C. Violet and blue
  • D. Blue and green
  • E. Red and indigo
View Answer & Discuss WAEC 1990
122
Given that the gravitational constant is 7 X 10-11 Nm2kg-2, what is the force of attraction between 106kg mass of lead hanging one metre away from a 103kg mass of iron?
  • A. 7 x10-20N
  • B. 7 x 10-5N
  • C. 7x10-2N
  • D. 7x103N
  • E. 7x100N
View Answer & Discuss WAEC 1990
123
Calculate the current in the 3Ω resistor shown in
the diagram above.
  • A. 3.0A
  • B. 4.0A
  • C. 4.3A
  • D. 12.0A
  • E. 39.0A
View Answer & Discuss (8) WAEC 1990
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124

What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = εo)

  • A. 4πεoq2r
  • B. qr/4πεo
  • C. q/4πεor
  • D. q2/4πεor
  • E. q2/4πεo
View Answer & Discuss (9) WAEC 1990
125
A work of 30 joules is done is transferring 5 millicoulombs of charge from a point B to a point A in an electric Held. The potential difference between B and A is
  • A. 1.7 x 10-4V
  • B. 3.4x10-4V
  • C. 1.5x10-1V
  • D. 6.0 x103V
  • E. 1.2 x104V
View Answer & Discuss (13) WAEC 1990
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