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## Class 10 Physics (India)

### Course: Class 10 Physics (India)>Unit 4

Lesson 1: Magnets and magnetic fields

# Intro to magnetic fields (Why fields?)

Let's explore what magnetic fields are and why do we like to talk about them? Created by Mahesh Shenoy.

## Want to join the conversation?

• if north poles repel each other, then why does the north pole of a magnetic compass point towards north direction?
• It is true that like poles repel and unlike poles attract. But it is also true that the north pole of a magnetic compass points towards the geographical north direction of the Earth. This sure does create a confusion but the answer is quite simple.
Earth behaves like it has a giant magnet within it. This magnet, however, works rather differently. Earth's geographical north pole is actually its magnetic south pole and the geographical south pole is actually its magnetic north pole.
So, when you ask why the north pole of the compass and the north pole of Earth attract (points in the north direction), it is because the geographical north pole is actually the magnetic south pole. It is already known that unlike charges attract.
This is why the north pole of a magnetic compass points towards the geographical north (magnetic south).
Hope this helps..
• Won't the magnetic fields decrease from outer edge to inner edge? coz magnetic fields are higher in small distances??
• The density of magnetic field lines determine the power of a magnet in that area and in the outer edge lines are less dense.
• Can the magnetic field affect electrons around it?
• An electron can be deflected by magnetic as well as electric field.

A magnetic field exerts a force on a moving charge, where the force is proportional not only to the field strength but also to the speed of the charged particle.

The direction is perpendicular to the field and perpendicular to the direction of motion.
• What exactly is a magnetic field? Why does this push and pull happen?
• Why exactly do like poles repel each other while unlike poles attract each other?
• Because the lines of north pole are find a south pole to merge into but when another north pole emerges, they don't merge into it and as lines don't intersect, they try to repel each other
(1 vote)
• At animation shows that fragrance of jasmine flower starts reducing from the center towards the outer end, shouldn't it be other way round ,that is, fragrance should start reducing from the outer end to the center, do you think this should be same for magnets?
• Mahesh and David should do a collab video. That would be ill
• are the two magnets pushing each other and they are moving away apart? or on of the magnets is moving and the other does not
(1 vote)
• Newton's third law of motion , "Every action has an equal and opposite reaction." Going by that, it would be correct to say that both magnets are pushing each other.
(1 vote)
• defination of magnetic field ? difference between magnetism and magnetic field
(1 vote)
• The magnetic field is the area around a magnet in which the effect of magnetism is felt.
(1 vote)
• you pushed the ball with your teet