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What is a magnetic field? How can the direction of magnetic field lines at a place be determined?
A portable radio has a built-in transformer so that it can work from the mains instead of batteries. Is this a set-up or step down transformer?
Explain the following :
The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.
Explain the method of plotting the magnetic field lines by using a small compass needle.
State whether the magnetic field lines in part (a) represent a uniform magnetic field or non-uniform magnetic field?
Answer the following question.
Draw the pattern of magnetic field lines of
(i) a current-carrying solenoid and
(ii) a bar magnet.
List two distinguishing features between the two fields.
Select the correct option:
The magnetic strength of a bar magnet is:
Magnetic lines of force never ______ each other.
State the inference drawn about the direction of the magnetic field lines on the basis of the following diagrams.
 |
 |
| Figure 'a' | Figure 'b' |
Assertion (A): Magnetic field lines never intersect each other.
Reason (R): If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.
