Electromagnetism Flashcards

1
Q

Magnetic field around a current carrying wire

A
  • Magnetic field is made up of concentric circles (circles which have the same center point)
  • Shows that the magnetic field around a wire has no poles
  • The further away from the wire, the further apart the circles are: shows the magnetic field is strongest closest to the wire
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2
Q

Right hand rule

A
  • Thumb shows direction of current
  • Fingers show direction of magnetic field
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3
Q

How to reverse direction of magnetic field

A
  • Reverse direction in which current flows
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4
Q

What is a conducting wire?

A
  • Any wire that has current flowing through it
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5
Q

Magnetic field around a solenoid

A
  • To increase the strength of the magnetic field around a wire, we cant coil it up to form a solenoid
  • The magnetic field inside a solenoid is strong and uniform (same strength and direction at any point)
  • Magnetic field lines are the same as a bar magnet
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6
Q

What is a solenoid?

A
  • When a wire is looped to form lots of coils in one long piece of wire
  • An electromagnet (as it has a North and South pole)
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7
Q

How can we increase the strength of an electromagnet?

A
  • Increase the current flowing through
  • Increase the number of coils by keeping the length the same (coils are more dense)
  • Decrease the length while keeping the number of coils the same (coils are more dense)
  • Add an iron core (soft magnetic material which will become induced)
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