How can you test to see if there is a current running through a wire?

place several compasses around the wire

listen carefully to see if you hear a buzzing sound

place several batteries around the wire

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.

Alternately, anticlockwise then clockwise

Alternately, clockwise then anticlockwise

A current-carrying coil in a magnetic field experiences a turning effect. How can the turning effect be increased?

increase the number of turns on the coil

reverse the direction of the magnetic field

The diagram shows a coil of wire between the poles of a magnet. The coil consists of 20 turns of insulated wire. The coil is connected to a variable resistor and a power supply. How can the turning effect on the coil be increased?

by moving the poles of the magnet closer to the coil

by reducing the number of turns on the coil while keeping the current constant

by increasing the resistance of the variable resistor

by reversing the terminals of the power supply

What happens to the strength of a magnetic field as you move away from the magnet?

The strength of the magnetic field decreases.

The strength of the magnetic field increases.

The strength of the magnetic field doesn't change.

The strength of the magnetic field is doubled.

The magnitude of the force on a current carrying conductor in a magnetic field can be increase by all of the following EXCEPT

use wire with larger cross sectional area

Diagram below shows the apparatus used to study the effect of an electromagnet. Which change will increase the number of paper clips attracted to the iron rod?

Increase the magnitude of the current

Use a thinner wire to form the coils

Use a non-insulated wire to form the coils

Diagram 32 shows a design of a simple circuit breaker. It is designed to prevent an electrical circuit from damage caused by excessive current or short circuit. Which statement is the best to explain why the iron armature should be made of iron?

Its strong and magnetic material

Its magnetic material and has high melting point

Its strong and a good conductor of heat

Its flexible and a good electrical conductor

Diagram below shows an electric motor. The magnitude of force F increases when

the resistance of the wire coil decreases

the number of turns of the wire coil decreases

the magnitude of the electric current decreases

the magnitude of the magnetic field decreases

The diagram below shows a straight conductor placed in a magnetic field. Both of the soft springs extend when the switch is on. Which change will decrease the extension of the springs?

Increase the distance between magnets

Increase the number of batteries

The diagram below shows a wire QR hangs freely between two strong magnets. The angle of deflection, θ is increased by

changing the polarity of the magnet

increasing the resistance of the wire QR

increasing the distance between the poles of the magnet

Force on a Current Carrying Wire

Authored by Charles Martinez

Physics

11th Grade

NGSS covered

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MULTIPLE SELECT QUESTION

1 min • 1 pt

b) based on the diagram above, choose the direction of the forces that act on the sides AB and CD of the coil.

AB:UPWARD;CD:DOWNWARD

AB:DOWNWARD;CD:UPWARD

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FILL IN THE BLANK QUESTION

1 min • 1 pt

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

(a)

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NGSS.HS-PS2-5

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MULTIPLE SELECT QUESTION

1 min • 1 pt

What does the thumb indicate in flemings left hand rule?

Force

current

Magnetic field direction

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NGSS.HS-PS2-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What direction is the force/motion in the following diagram?

Perpendicular to the magnets

Downwards

Parallel and through the magnets

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A represented by

direction of magnitude current

direction of force

direction of magnetic field

direction of rotation

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Diagram shows a dc motor. What is the functions of brush carbon?

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

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

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

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE SELECT QUESTION

1 min • 1 pt

Application of the force on current carrying conductor in a magnetic field

Moving coil ammeter

dynamo

Dc motor

electrIc bell

Dc generator

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

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Force on a Current Carrying Wire

b) based on the diagram above, choose the direction of the forces that act on the sides AB and CD of the coil.

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

What does the thumb indicate in flemings left hand rule?

What direction is the force/motion in the following diagram?

A represented by

Diagram shows a dc motor. What is the functions of brush carbon?

Application of the force on current carrying conductor in a magnetic field

How can you test to see if there is a current running through a wire?

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.

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

(a)