Electricity and...

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?