Electromagnetism

Question 1

The motor effect

Answer 1

When a current carrying wire is put between magnetic poles the two Magnetic Fields interact with each other the result is a force on The Wire

Question 2

Electric motor

Answer 2

Four factors of which speed it up more current more turns on the coil stronger magnetic field a soft iron core

Coil is on a spindle and forces act 1 up 1 down so it rotates

Split ring commutator is needed to swap the contact every half term to keep the motor rotating in the same direction

Question 3

Loudspeaker

Answer 3

AC electrical signals from amplifier fed into the coil of wire in speaker which is wrapped around base of cone

Coil surrounded by permanent magnet signals due to the interaction of the two Magnetic Fields causes a force moves back and forth

Movements make phone vibrate creates sound