Ch:20 Electromagnetic forces

A coil carries a current in a magnetic field. The coil experiences a turning effect. Which device uses this effect?

• a d.c. motor

• an electromagnet

• a relay

• a transformer

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

A toy railway engine is driven around a track by a d.c. electric motor. How can the speed of the motor be increased?

• Use a motor made with fewer turns of wire.

• Use a smaller d.c. voltage.

• Use a stronger magnet in the motor.

• Use the supply with its connections reversed.