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Physics 1998 WAEC Past Questions

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41
Calculate the resistance of the filament of lamp rated at 240V 60W
  • A. 240\(\Omega\)
  • B. 360\(\Omega\)
  • C. 960\(\Omega\)
  • D. 144\(\Omega\)
  • E. 2880\(\Omega\)
View Answer & Discuss (2) WAEC 1998
42
The diagram above illustrates a freely suspended bar magnet NS hanging from a point in a horizontal ceiling. The thread used for suspending the magnet and the axis of the magnet are as indicated on the diagram. The angle marked \(\theta\) is called the angle os
  • A. depression
  • B. declination
  • C. variation
  • D. elevation
  • E. dip
View Answer & Discuss (3) WAEC 1998
43
Lenz's law of electromagnet states that
  • A. the induced charge is constant for a fixed change of force
  • B. a force is exerted on a current-carrying conductor in a magnetic field
  • C. the magnitude of the induced e.m.f in a circuit is proportional to the rate of change of the number of lines of force linking the circuit
  • D. the induced current in a conductor is in such a direction as to oppose the change producing it
  • E. e.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit
View Answer & Discuss WAEC 1998
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44
A proton of charge 1.6 x 1019C is projected into a uniform magnetic field of flux density with a constant speed of 1.6 x 106ms-1, calculate the magnitude of the force exerted on it by the field
  • A. 0.0N
  • B. 2.0 x 10-21N
  • C. 1.3 x 10-17N
  • D. 5.1 x 10-14N
  • E. 2.3 x 1013N
View Answer & Discuss WAEC 1998
45
The direction of the magnetic field at a point in the vicinity of a bar magnetic is
  • A. along the line joining the point to the neutral point
  • B. always away from the south pole of the magnet
  • C. opposite the direction of theresultant field at that point
  • D. always towards the north pole of the magnet
  • E. the direction towards which the north pole of a compass needle would point
View Answer & Discuss WAEC 1998
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