Electricity

A cell of EMF 2V and internal resistance 0.5 Ohm is connected to an external resistance of 9.5 Ohms. What is the terminal potential difference?

Two copper wires A and B have lengths in ratio 1:2 and radii in ratio 2:1. The ratio of their resistances is:

A transformer is 90% efficient. If it consumes 1000W and the output voltage is 100V, what is the output current?

The drift velocity of electrons in a copper wire is of the order of:

What is the equivalent resistance of the network shown in the figure?

A 220V, 100W bulb and a 220V, 40W bulb are connected in series to a 220V supply. Which bulb will glow brighter?

Two charges of 1C each are placed 1m apart in vacuum. The force between them is:

Which of the following is used to convert a galvanometer into an ammeter?

Which of the following is used to convert a galvanometer into a voltmeter?

What is the peak voltage of a 220V RMS AC supply?

The Lenz's law is a consequence of the law of conservation of:

The self-inductance of a coil does NOT depend on:

Four identical resistors each of resistance R are connected to form a square. The equivalent resistance between opposite corners is:

In a step-up transformer, the current in the secondary coil compared to the primary coil is:

Which of the following materials has a negative temperature coefficient of resistance?

What is the equivalent resistance of three resistors of 3 Ohms each connected in parallel?

If the current through a resistor is doubled, the power dissipated becomes:

A heater is marked 220V, 2200W. What is the current flowing through it?

In a household circuit, appliances are connected in:

The work done in moving a unit positive charge from one point to another is called: