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## Class 10 Physics (India)

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

Lesson 3: Magnetic field due to current carrying loops and solenoids

# Magnetic field due to current carrying loop

Let's explore the magnetic field generated due to the current carrying loop. The field pattern might be familiar to you. Created by Mahesh Shenoy.

## Want to join the conversation?

• At we see that the iron filings are arranged in a straight line, does that mean that in a circular magnetic electric circuit and particle placed exactly in the middle inside the circle would be held in place and not experience any force?
• the current was not strong enough the fillings to get attracted.But if it were then you would see the force
hence the middle would exp the force
• will a magnetic field in real life be in the form of a horizontal stack of the pattern of lines we see in the video? (one pattern behind the other)
• In real life the magnetic field will be in a 3d doughnut shape with one straight line in the centre and multiple lines surrounding it which will bend slightly more than the previous one.
• In the magnetic field the lines are coming north to south but the straight line passing south to north why?
• Just as in a bar magnet, the field lines outside the bar magnet loop from north to South Pole and the field lines inside the bar magnet go from south to north thus completing a circle of sorts. We can see this figure at
• Hey everyone, so as Mahesh describes at in this video. The direction of the magnetic field "Inside the loop is upwards, outside the loop is downwards."

My question, is this just in regards to the current travelling in this direction as shown. If the current was set up to be travelling in the opposite direction, would the magnetic fields direction be reversed too "inside the loop is downwards, outside the loop is upwards"

Hope this is clear to everyone. Thanks again to Mahesh! really enjoying the examples, Khanacademy is a great resource
• Ah.. Just watch the next video on Solenoids. For reference, Mahesh does mention switching the poles of the electromagnet by reversing the current. Brilliant!
• why is the wire coiled so much?? Couldn't it be used as a single coil
(1 vote)
• At , the loop is connected to the mains via two other Copper wires... Why aren't they creating a magnetic effect?
(1 vote)
• At , the magnetic field around the circular loop resembles that of a bar magnet. So, do the magnetic field lines merge at the centre?
(1 vote)
• NO they dont merge but they come very close to each otoher and hence increasing the field strength
(1 vote)
• why the loop is going up and down
(1 vote)
• How do you calculate the magnetic downwards force of a current-carrying solenoid that is perpendicular to a magnetic field from two neodymium magnets?
(1 vote)
• How can we clasp a wire that has current flowing through it without having access to any props?