3.2 Force on a current-carrying conductor in magnetic field

Why might a current-carrying wire be placed between a magnetic field?

• To increase the current from the interaction of magnetic fields

• To increase the voltage from the interaction of magnetic fields

• To produce a force from the interaction of magnetic fields

Tags

NGSS.HS-PS2-5

Figure 1 and Figure 2 show the structures of a d.c motor and a d.c. motor respectively. State the change of energy that occurs in a motor.

• Electrical energy to kinetic energy

• Kinetic energy to electrical energy

The figure shows the structure of a motor. Which of the following will not affect the speed of rotation of the motor?

• The current in the coil

• Strength of the magnetic field

• The number of turns of wire in the coil

• The direction of the current in the coil

c) What is the rule that is used to determine the direction of the force that acts on the coil?

c represented by

• direction of magnetic field

• direction of rotation

• direction of force

• direction of magnitude current

What is the functions of commutator?

• Reverse the direction of current in the coil every half rotation so that the coil continues to turn in same direction

• To contact with the commutator so the current from the battery enters the coil.

• Push the brush so it will always contact with the commutator.

Diagram shows a coil placed between the poles of a permanent magnet and is connected to the external circuit.Determine the direction of rotation of the coil when the switch is closed.

• Clock wise

• Anti Clock wise

• Alternately, anticlockwise then clockwise

• Alternately, clockwise then anticlockwise

Diagram shows a coil placed between two opposite magnetic poles. An electric current flows through the coil producing a pair of turning force, F.Which diagram shows the correct catapult field ?

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Diagram shows a current–carrying conductor placed between the poles of two magnet bars. Which diagram shows the resulting magnetic field ?

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Diagram shows a current – carrying conductor in magnetic field. What is the direction of the force that acts on the conductor ?

• A

• B

• C

• D