Magnetic Field Lines

Q. When iron filings are spread on a piece of paper with a bar magnet at the center, the iron filings align themselves along the of the bar magnet.

1. magnetic field lines
2. electric field lines
3. circumference

Q. Magnetic field lines behave as if they are in a state of tension like stretched spring.

1. True
2. False

Q. Magnetic field lines are in a state of tension like a stretched string.

1. True
2. False

Q. Which of the following objects uses an electromagnet?​​

1. Electric heater​​
2. Magnetic compass​​
3. Electric bell​​
4. Electric bulb​​