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

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1979

Which of the following statements is incorrect? The sensitivity of a galvanometer which incorporates an optical lever arrangement may be increased by providing

A. A larger number of turns in the coil
B. A thinner suspension with a small torsional control
C. A special alloy permanent magnet which gives a high magnetic flux
D. All of the above
E. A light source with a greater intensity

Question 3:

• JAMB 1979

On which of the following is the operation of a moving coil galvanometer based?

A. Magnetic effect of electric current
B. Electromagnetic induction
C. Chemical reaction produced by electricity
D. Force on current carrying conductor in a magnetic field
E. Electrical energy and power

Question 4:

• JAMB 1984

The electromotive force obtained from a simple dynamo may be increased by

A. Increasing the cross-sectional area of the coil
B. Winding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil
C. Increasing the speed of rotation
D. Making the field magnet longer
E. Using low-resistance copper coils

Question 5:

• JAMB 1987

A galvanometer of resistance 20\(\Omega\) is to be provided with a shunt that \(\frac{1}{10}\) of the whole current in a circuit passes through the galvanometer. The resistance of the shunt is

A. 2.00\(\Omega\)
B. 2.22\(\Omega\)
C. 18.00\(\Omega\)
D. 18.22\(\Omega\)