9_Force on a Current Carrying Conductor

Multiple Choice

Magnetic field produced around a straight conductor due to current in it is given by

• Fleming's right hand rule

• Right hand grip rule

• Clock rule

• Fleming's left hand rule

Multiple Select

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

Fill in the Blanks

Multiple Choice

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

Multiple Choice

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

Multiple Select

What does the thumb indicate in flemings left hand rule?

• Force

• Motion

• Current

• Magnetic field direction

Multiple Choice

Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?

• Gravity

• Magnetic flux density/size of magnetic field

• Size of the current

• Length of the conductor

Multiple Choice

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

Multiple Choice

c represented by

• direction of magnetic field

• direction of rotation

• direction of force

• direction of magnitude current

Multiple Choice

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.

Multiple Choice

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

Multiple Choice

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 ?

Multiple Choice

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

Multiple Choice

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

Multiple Choice

The speed of direct current motor can be reduced by

• increasing the amount of current

• increasing the strength of magnet

• increasing number of turns of coil

• increasing the resistance of coil wire

Multiple Choice

A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• In the same direction as the magnetic field

Multiple Choice

What does the following represent?

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

• Multiplied by a billion

• A piece of modern art

• Uniform magnetic field directed into the screen away from you

• Uniform magnetic field directed out of your screen at you

Multiple Choice

The strongest part of a magnet is...

• the bars .

• the force field.

• the poles.

• the middle.

Multiple Choice

What does the following represent?
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙

• A crowd with binoculars
• A bunch of coaxial cables 
• Uniform magnetic field directed into the screen away from you
• Uniform magnetic field directed out of your screen at you

Multiple Choice

A current carrying wire lies between the poles of

two magnets, as shown. What is the direction of the force on the wire?

• Into the plane of the paper

• Out of the plane of the paper

• Towards the N-pole

• To the right

Open Ended

Based on the video, what do you think about motor effect?

Multiple Choice

The way that we can do to change the direction of the force is ?

• Reversing the voltage

• Reversing magnetic fields

• Reversing the cable

Open Ended

What is direction of the current?

Open Ended

An electric current is moving from right to left in the wire. Which way does the induced magnetic field point to the location of the triangle?