Search SchoolNGR

Sunday, 16 August 2026
Register . Login

Physics Past Questions and Answers

Topic: Force on a Current-Carrying Conductor in a Magnetic Field

Jamb Physics Questions - Force on a Current-Carrying Conductor in a Magnetic Field

Question 1:
The value of the series resistor required to convert the above galvanometer into a voltmeter with a full range deflection of 15V is
  • A 985 ohms
  • B 990 ohms
  • C 995 ohms
  • D 1000 ohms
  • E 1005 ohms
View Answer & Explanation
Question 2:
A galvanometer of resistance 5.0W has full-scale deflection for a current of 100mA. How would its range be extended to 1.0A? By placing a resistance of
  • A \(\frac{5}{9}\)\(\Omega\) in parallel
  • B \(\frac{9}{5}\)\(\Omega\) in series
  • C 45\(\Omega\) in parallel
  • D 45\(\Omega\) in series
  • E \(\frac{9}{5}\)\(\Omega\) in parallel
View Answer & Explanation
Question 3:
Which of the following is NOT a part of a d.c. electric motor?
  • A Field-magnet
  • B Armature
  • C Commutator
  • D Transformer
View Answer & Explanation
Question 4:
When two parallel wires carry currents in opposite directions, the force on either wire is
  • A Away from the other wire
  • B Zero, because the currents cancel each other
  • C Twice as much as when the currents are in the same direction
  • D Towards the other wire
View Answer & Explanation
Question 5:
Two insulated charged spheres of different sizes and carrying opposite charges are connected together by a metallic conductor. Current will flow from one sphere to the other until both sphere
  • A Carry the same magnitude and sign of charge
  • B Are at the same potential
  • C Are at the same temperature
  • D Are of the same size
View Answer & Explanation