Physics Past Questions and Answers

A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively.
This internal resistance of the cell is

The particles emitted when \( ^{39}_{19}K \text{ decay to } ^{39}_{19}K \) is

I. Low pressure.
II. High pressure.
III. High p.d.
IV. Low p.d.
Which combination of the above is true of the conduction of electricity through gases?

The current through a resistor in an a.c circuit is given as 2 sin wt. Determine the d.c. equivalent of the current

The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils has 1 000 turns and a terminal voltage of 1 200 volts, what is the value of N?