Physics
A conductor AB is kept along north south direction of the earth above a magnetic needle as shown below. When the key K is closed then:
- the needle will not show any deflection.
- the needle will deflect towards east.
- the needle will turn in the opposite direction i.e. towards south.
- the needle will deflect towards west.
Related Questions
The graph plotted for potential difference (V) against current (I) for ohmic resistors is :
- A curve passing through the origin.
- A straight line not passing through origin.
- A straight line passing through the origin.
- A circle centred at the origin.
A main switch in the main distribution board is present in :
- a live wire
- a neutral wire
- a live as well as neutral wire
- an earth wire
A coil wound around a piece of soft iron can become an electromagnet only when:
- the circuit is open.
- a magnetic compass is present in the vicinity.
- a galvanometer is connected to the circuit.
- a current flows in the circuit.
If water absorbs 4000 joule heat to increase the temperature of 1 kg water through 1°C then the specific heat capacity of water is :
- 4 Jkg-1°C-1
- 400 Jg-1°C-1
- 4 Jg-1°C-1
- 4.2 Jg-1°C-1