Physics Past Questions and Answers

Two capacitance of 6\(\mu\)F and 8\(\mu\)F are connected in series. What additional capacitance must be connected in series with this combination to give a total of 3\(\mu\)F

A 3\(\mu\)F
B 16\(\mu\)F
C 24\(\mu\)F
D 30\(\mu\)F

Question 467:

When a transformer has more secondary windings than primary windings, it

A Has a smaller secondary current
B Has a greater power output
C Is a step-down transformer
D Increases the total energy output

Question 468:

A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?

A 1200J
B 1500J
C 2400J
D 96000J

Question 469:

The direction of the magnetic field at a point in the vicinity of a bar magnet is

A Always towards the north pole of the magnet
B Always away from the south pole of the magnet
C Along the line joining the point to the neutral point
D In the direction the north pole of a compass needle would point

Question 470:

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