Differences and similarities between toroid and solenoid


We all know what a toroid and a solenoid look like and their structure, functions, uses, etc., but to think of it there can be the difference and similarities between them. After spending some time on my own little research about this I have come to a conclusion about the difference and similarities between a toroid and solenoid.

Differences between solenoid and toroid:

Solenoid Toroid
Cylindrical in shape Circular in shape
Magnetic field is created outside Magnetic field is created within
Has uniform magnetic field inside it. It does not have a uniform magnetic field inside it.
Magnetic field due to solenoid is (B) = Uo.ni Magnetic field outside:- magnetic field (B) = 0
Magnetic field inside:- magnetic field (B) = 0
Magnetic field within the toroid:- magnetic field (B) = Uo.ni

Similarities between solenoid and toroid:

Similarities between solenoid and toroid
1. Both works on the principle of electromagnetism.
2. When current is passed through them, they both act like an electromagnet.
3. Magnetic field due to the solenoid and within the toroid is the same. B = Uo.ni.

What are toroid and solenoid ?

These are devices used as an electromagnet when current is passed through them

Solenoid:

 Current passing through a solenoid
Current passing through a solenoid 

A long wire wrapped around in helical shape is known as solenoid. They are cylindrical in shape as you can see in the image above. A solenoid is used in experiments and research field regarding the magnetic field. The magnetic field inside solenoid is uniform.

A solenoid is used in speakers and microphones as well.

Toroid:

 Current passing through a toroid
Current passing through a toroid

Unlike solenoid, the shape of the toroid is circular in shape and coil wrapped around toroid is circular in shape. You can use toroid in electric devices with low frequency.

Conclusion:

Solenoid and toroid both work on the principle of electromagnetism and both behave like an electromagnet when current is passed. The magnetic field produces by them is B = Uo.ni. Even after having so many similarities solenoid and toroid differs in property such as shape:

1. A solenoid is cylindrical in shape whereas toroid is circular.

2. Magnetic field is produced outside in solenoid whereas magnetic filed outside of toroid is zero and the magnetic field is produced within.

3. The solenoid has a uniform magnetic field whereas toroid does not have a uniform magnetic field within.

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2 Comments

  1. A toroid is a solenoid wrapped around so that both ends touch.

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    1. Yes I agree but this small difference in shape creates a huge difference in their property.

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