Physics
Assertion (A): In a simple closed circuit made using a torch bulb and an electric cell, electric current flows because tiny particles move inside the wire.
Reason (R): These tiny particles are electrons that drift from the negative terminal of the cell towards the positive terminal outside the cell.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Electro-Magnetism
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Answer
Both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because in a closed circuit, electric current flows due to the motion of tiny charged particles within the conductor.
Reason (R) is true because these tiny particles are negatively charged electrons, which drift from the negative terminal of the cell towards the positive terminal through the external circuit.
The Reason justifies the Assertion because it explains that the tiny particles i.e., electrons and their drift from negative to positive terminal causes the electric current.
Therefore, both A and R are true and R is the correct explanation of A.
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Identify the correct advantages of dry cells:
- Dry cells are light in weight and small in size.
- There is no fear of leakage in dry cells.
- Dry cells can be easily carried from one place to another.
- All of the above
Assertion (A): A freely suspended magnet rests in north-east direction.
Reason (R): Earth has its own magnetic field and the suspended magnet aligns with it.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Fill in the blanks:
(a) A magnet has …………… poles.
(b) Like poles …………… each other and unlike poles …………… .
(c) An electromagnet is used to separate large mass of …………… scrap.
(d) The strength of magnetic field of an electromagnet is increased by inserting a core of …………… .
(e) In a torch, we use …………… as the source of electricity.
(f) To light a table lamp and to run a refrigerator, we use …………… as the source of electricity.
(g) A group of two or more cells is called a …………… .
(h) …………… pass electricity through them.
(i) …………… do not pass electricity through them.
Write true or false for each statement:
(a) A current carrying coil when suspended freely can rest in any direction.
(b) A coil carrying current behaves like a magnet.
(c) In an electromagnet, the core is made up of copper.
(d) An electric bell uses an electromagnet.
(e) An electromagnet with soft iron core is a temporary magnet.
(f) We use cell as the source of electricity to run an electric immersion rod.
(g) A torch bulb glows if the terminals of the bulb are connected to the terminals of a cell by the metallic wire.
(h) Wool is a conductor of electricity.
(i) Silver is an insulator of electricity.
(j) Our body is a conductor of electricity.
(k) For a circuit to be complete, every part of it must be made up of conductors.
(l) All metals are conductors of electricity.
(m) The switch should not be touched with wet hands.
(n) A switch is an on-off device in an electric circuit.