Physics
The strength of an electromagnet can be increased:
- by increasing the number of turns in the coil.
- by decreasing the number of turns in the coil.
- by inserting a soft iron core in the coil.
- both increasing the number of turns in the coil and inserting a soft iron core.
Electro-Magnetism
1 Like
Answer
both increasing the number of turns in the coil and inserting a soft iron core.
Reason — The strength of an electromagnet can be increased by the following three ways :
- By inserting a rod of soft iron or steel inside the cylindrical tube.
- By increasing the total number of turns in the coil.
- By increasing the strength of current passing through the coil.
Answered By
2 Likes
Related Questions
Electricity does not flow through:
- human body
- animal's body
- rubber
- silver
We should not touch the switch with wet hands, otherwise:
- electricity may pass through our body
- electricity may not pass through the appliance
- circuit may break
- the switch may get off
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