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1351

At different locations on the earth's surface, the earth's magnetic field is

  • A. the same in magnitude and direction
  • B. the same in magnitude but different in direction
  • C. different in both magnitude and direction
  • D. different in magnitude but different in direction
View Answer & Discuss (17) JAMB 1995
1352
If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is
  • A. 1 : 6
  • B. 1 : 3
  • C. 2 : 1
  • D. 6 : 1
View Answer & Discuss (3) JAMB 1995
1353
A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is
  • A. 16.0A
  • B. 8.0A
  • C. 0.8A
  • D. 0.4A
View Answer & Discuss (4) JAMB 1995
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1354

The purpose of a dielectric material in a parallel plate capacitor is to

  • A. increase its capacitance
  • B. decrease its capacitance
  • C. insulate the plate from each other
  • D. increase the magnetic field between the plates
View Answer & Discuss (16) JAMB 1995
1355
An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced
  • A. 0.5kJ
  • B. 8.0kJ
  • C. 20.0kJ
  • D. 40.0kJ
View Answer & Discuss (9) JAMB 1995
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