Question 31:

• JAMB 1978

A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on

A. The number of turns in the coil
B. The strength of the magnet
C. The speed at which the magnet is moved
D. All of the above
E. None of the above

Question 32:

• JAMB 1978

In order to convert a galvanometer into an ammeter

A. A low resistance shunt is connected in parallel
B. A low resistance shunt is connected in series
C. A medium resistance shunt is connected in series
D. A high resistance shunt is connected in parallel
E. A high resistance shunt is connected in series

Question 33:

• JAMB 1978

In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is

A. 10 ohms
B. 1 ohms
C. Zero
D. 20 ohms
E. Infinite

Question 34:

• JAMB 1978

On an a.c generator, which of the following does not apply?

A. Field magnet
B. Commutator
C. Armature
D. Slip rings
E. Carbon brushes

Question 35:

• JAMB 1978

Why is it impossible for the lines of force of an electric field to cross one another?

A. Like charges repel each other
B. A charged particle is deflected by an eletric field
C. Like charges are arranged on the same line of force
D. A positively charged particle can travel in only one direction at any time
E. None of these is correct