Electricity and...

The rod or stem in a gold leaf electroscope is made up of

What is the current in a wire through which 20.0 C of charge passes in 4.00 s?

A conductor carries a current of 0.3 A for 20 s. How many electrons will flow in this time interval if charge on one electron is 1.6 10^-19 C?

The current flowing in a conductor of resistance `R` ohm is `I` mpere. What amount of current will be flowing in a conductor, if the resistance of conductor is doubled keeping the potential difference across it the same?

On which of the following factors does electrical resistivity of a given metallic wire depend?

A cylindrical conductor of length '' and uniform area of cross-section 'A' has resistance R. What will be the area of cross-section of another conductor of the same material but of length '2' and resistance 'R'?

Electron volt is the unit of

When a fuse is rated 8 A, it means

In a household circuitry, the appliances are connected in

An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?

A 6V, 12 W lamp is connected in series with a resistor R and a source of 12 V supply. What is the value of the resistor R for the proper working of the lamp?

An electric bulb is rated 220 V and 110 W. When it is operated on 110 V, what amount of power will be consumed?

What is the current flowing into a microwave oven that requires 800 W of power if the potential difference is 220 V?

If a magnet is cut into two pieces of equal length, then

The strength of an electromagnet can be influenced by

Three students A, B and C took a permanent magnet each and tried to damage it. Student A exposed it to a very high temperature, while student B hammered it strongly and student C dropped it from a very tall building.
The magnet of which of the following students is likely to be damaged?

If `F` is the magnitude of force acting on a current (I) carrying conductor placed in a magnetic field in a direction perpendicular to it, then

The direction of force on a current carrying conductor placed in a magnetic field is obtained by

How will the direction and magnitude of force be changed, if the current is reversed in the conductor placed in a magnetic field?

The diagram shows two coils, coil-1connected with a battery and coil-2 with a galvanometer as shown in the figure below. Current is induced in coil-2 when current in coil-1 is changed.



What happens to the needle of galvanometer if the current in the coil is increased?