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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 fields through solenoids

Let's learn what solenoids are, and why are they important. We will see that when we pass current through a solenoid, it produces a magnetic field similar to a bar magnet. Created by Mahesh Shenoy.

## Want to join the conversation?

• Why does the field lines becomes straight at the center if the field lines always form concentric circles ?
• *the lines are nearly straight not expect but ya some what!*
*As the loops are so big that this small part nearly gives a straight line .*
• What all applications(in daily life) use variable magnetic fields?
• it is used in speakers and microphones. It is also used in motors and fans.
(1 vote)
• Would hard irons make magnetic fields stronger too or just soft irons?
• Hard irons when magnetized are very hard to demagnetize but soft iron can easily be magnetized or demagnetized easily. It depends on the number of turns of the solenoid or the current flowing through them. I hope this helps you :D.
• What are some examples of solenoids that we use in everyday life?
(1 vote)
• I know that they are used in speakers and microphones.
• how do we find the north and south pole in a solenoid?
(1 vote)
• we know the magnetic field inside a bar magnet goes south to north. so if we find the direction of magnetic field inside a solenoid we will find which pole is north or south
• what are the sources of magnetism
?
(1 vote)
• Well magnetic components create attraction which we find field lines created. Presence of field lines constitute magnetism
(1 vote)
• Can we change the direction the magnetic field of a solenoid
(1 vote)
• How can I determine where the north pole or the south pole it?
(1 vote)
• Would a hard iron create a stronger magnetic field than a soft iron if taken in the same quantity?
(1 vote)
• For creating a stronger magnetic field, you will have to increase the number of turns.
Generally, a hard iron differs from a soft iron only in the property that the former is harder to de-magnetize.
(1 vote)
• What happens to a proton with a certain velocity if it were to travel through the axis of the solenoid?
(1 vote)