solenoid

what is a solenoid

A solenoid is a coil of wire with electric current flowing through it. You can see a solenoid in the Figure 1.1. Current flowing through the coil produces a magnetic field that has north and south poles. Click image to the left or use the URL below. URL: Q: How is a solenoid like a bar magnet? A: Like a bar magnet, a solenoid has north and south magnetic poles and is surrounded by a magnetic field.

strength of a solenoid

Any wire with current flowing through it has a magnetic field. However, the magnetic field around a coiled wire is stronger than the magnetic field around a straight wire. Thats because each turn of the wire in the coil has its own magnetic field. Adding more turns to the coil of wire increases the strength of the field. Increasing the amount of current flowing through the coil also increases the strength of the magnetic field.

textbook_image

uses of solenoids

A solenoid is generally used to convert electromagnetic energy into motion. Solenoids are often used in devices that need a sudden burst of power to move a specific part. In addition to paintball markers, you can find solenoids in machines ranging from motor vehicles to electric dishwashers. Another device that uses solenoids is pictured in the Figure 1.2.

instructional diagrams

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questions

a solenoid has a magnetic field like a bar magnet.

-->  a. true

b. false

a straight wire has a stronger magnetic field than a coiled wire.

a. true

-->  b. false

what explains the correct answer to question 5?

-->  a) each turn in a coil of wire has its own magnetic field.

b) the magnetic field of a wire is weakened when the wire is coiled.

c) coiling a wire decreases the amount of current flowing through it.

d) two or the above

solenoids are used in

a) paintball markers.

b) motor vehicles.

c) electric dishwashers.

-->  d) all of the above

solenoids are often used to provide a burst of energy to move a specific part of a device.

-->  a. true

b. false

diagram questions

No diagram questions associated with this lesson