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786
The diagrams above show lines of force in electric fields. In which of the diagrams would a positive test charge experience the least force as it moves from x to y?
  • A. I only
  • B. II only
  • C. III only
  • D. I and II only
  • E. II and III only
View Answer & Discuss (3) WAEC 1992
787

What is the electric potential at a point distance r from a proton of charge q placed in a medium of permittivity εo?

  • A. q2/4πεor2
  • B. q/4πεor2
  • C. q2/4πεor
  • D. q/4πεor
  • E. 4πεoq2r
View Answer & Discuss (2) WAEC 1992
788
lf the frequency of the a.c. circuit illustrated is 500Hz/ π what would be the reactance in the circuit?
  • A. 0.01Ω
  • B. 190.91 Ω
  • C. 200.00 Ω
  • D. 795.46 Ω
  • E. 1000.00Ω
View Answer & Discuss (1) WAEC 1992
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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789
Which of the following statements is correct about cathode rays? They are fast moving
  • A. atoms
  • B. ions
  • C. neutrons
  • D. protons
  • E. electrons
View Answer & Discuss (1) WAEC 1992
790
Which of the following gives rise to the line spectra obtained from atoms?
  • A. Kinetic energy of a moving atom
  • B. Potential energy of an electron inside an atom
  • C. Change of an electron from a higher to a lower energy level in the atom
  • D. Disturbed proton in the nucleus
  • E. Excitation of an electron in the atom
View Answer & Discuss WAEC 1992
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