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Physics 2010 WAEC Past Questions

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41
Which of the following factors will increase the sensitivity of moving coil meter?
  • A. strong spring
  • B. low numbers of turns
  • C. small area of coil
  • D. soft iron core
View Answer & Discuss (2) WAEC 2010
42
In order to prevent bar magnets from losing their strength, they are stored wih keepers such that the two bars are placed with
  • A. like poles facing each other and the keepers placed between them
  • B. like poles facing each other and the keepers placed between them
  • C. unlike poles facing each other and the keepers placed at their ends
  • D. unlike poles facing each other and the keepers placed between them
View Answer & Discuss WAEC 2010
43
The energy, E stored in an inductor of inductance L when current I passes through it is given by the equation
  • A. E = \(\frac{1}{2} LI^2\)
  • B. E = LI2
  • C. E \(\frac{1}{2}LI\)
  • D. E = \(\frac{1}{2} L^2I\)
View Answer & Discuss (11) WAEC 2010
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44
The resonant frequency of an a.c circuit is 1000 kHz. If each of the capacitance and inductance in the circuit is reduced by 50%, and no other changes are made, the resonant frequency will become
  • A. 250kHz
  • B. 750kHz
  • C. 1000kHz
  • D. 2000kHz
View Answer & Discuss (4) WAEC 2010
45

Eddy currents can be reduced by

  • A. using coil of high resistance
  • B. winding the coil on a soft iron core
  • C. creating holes in the metal plates
  • D. using coil of low resistance
View Answer & Discuss (3) WAEC 2010
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