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1586
When a number of identical small magnets are arranged in a line, the strength of the resultant magnet
  • A. ia largest when they are arranged end to end
  • B. is greatest when they are arrangedparallel with like poles adjacent to each other
  • C. depends only on the number of magnets provided they arev parallel
  • D. is greater when the magnets are arranged on a wooden surface than on a metaln surface
View Answer & Discuss (8) JAMB 1989
1587

A bar magnet is most effectively demagnetized by

  • A. placing it in a N - S position and hitting it with a hammer
  • B. subjecting it to an electric current from a battery
  • C. bringing its north pole in contact with the north pole of a very strong magnet
  • D. heating the magnet
View Answer & Discuss (15) JAMB 1989
1588

The resistance of a 5m uniform wire of cross-sectional area 0.2 x 10-6m2 is 0.425. What is the resistivity of the material of the wire?

  • A. 1.10 x 10-6\(\Omega\)m
  • B. 4.25 x 10-6\(\Omega\)m
  • C. 2.40 x 10-7\(\Omega\)m
  • D. 1.70 x 10-8\(\Omega\)m
View Answer & Discuss (13) JAMB 1989
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1589
Three resistors, with substances 250\(\Omega\), 500\(\Omega\) and 1k\(\Omega\) are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250\(\Omega\) resistor.
  • A. 0.20V
  • B. 0.86V
  • C. 1.71V
  • D. 3.43V
View Answer & Discuss (5) JAMB 1989
1590
A calibrated potentiometer is used to measure the e.m.f. of a cell because the
  • A. internal resistance of a cell is small compared with that of the potentiometer
  • B. potentiometer has a linear scale
  • C. potentiometer takes no current from the cell
  • D. resistance of the potentiometer is less than that of a voltmeter
View Answer & Discuss (7) JAMB 1989
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