Electricity and...

A glass rod rubbed with silk is brought near the cap of a negatively charged gold leaf electroscope. The leaf divergence will

If 18.75 10¹⁸ electrons flow through a conductor in 3 seconds, the total charge that flows through the conductor is

If the current in a household appliance is 6.00 A, what amount of charge passes through the appliance in 15.0 s?

There is no flow of current between two charged bodies when connected because

A cell is connected to a bulb which develops a potential difference of 16 volts across it. The current in the circuit is measured to be 2 amperes. What is the resistance offered by the filament of the bulb to the flow of current?

The V-I graph of two metallic wires A and B is shown below. Which of them has a greater resistance?

A wire has a resistance `R` and resistivity . What will be its resistivity, if its length is tripled and area is halved?

Resistance of a metallic wire of length `` and area of cross-section `A` is `R`. If the diameter of the wire is doubled, keeping the length unchanged, what will be the new resistance of the wire?

When the main switch of the house circuit is put off, it disconnects the

Tungsten is mainly used for making filaments of electric bulbs because of its

An electric iron consumes energy at a rate of 720 W when heating is at the maximum rate and 340 W when the heating is at the minimum. If the voltage is 220 V, what is the resistance in each case?

If 200 J of heat is produced every second in a 2 resistance, what is the potential difference across the resistor?

An electric refrigerator rated 400 W operates 6 hours per day. What is the cost of the energy to operate it for 30 days at Rs. 3.00 per kWh?

How much energy is used when a 110 kW appliance is used for 120 minutes?

When a bar magnet immersed in a heap of iron fillings is taken out, it is observed that iron fillings stick to the surface of the bar magnet. The iron fillings would

Which of the following statements are true about a permanent magnet?
(i) It is made up of steel.
(ii) It produces a permanent magnetic field.
(iii) The magnetic field strength of a permanent magnet can be changed.
(iv) It can be easily demagnetised.
(v) The permanent magnets are not so strong.

What happens when a conductor is placed in a magnetic field such that the current in it is in the direction parallel to the direction of magnetic field?

Which of the following phenomenon is used to generate electricity in generators?

As illustrated below, moving a magnet towards a coil sets up a current in the coil circuit, as indicated by deflection in the galvanometer needle.



Which of the following statements is NOT true?

Which of the following statements is NOT true?