Motor effect & induction

What does the thumb indicate in flemings left hand rule?

• Force

• Motion

• Current

• Magnetic field direction

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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

• Perpendicular to the magnets

• Downwards

• Parallel and through the magnets

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

• 180

• 45

• 90

• 270

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which rule can be used to work out which way a coil of wire rotates in a motor?

• Fleming's left-hand rule

• Fleming's right-hand rule

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

How does a split ring commutator work?

• Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

• Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.

• Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which action will increase the deflection of the galvanometer pointer?

• The magnetic pole is reversed

• The number of turns of coils is increased

• The coil is made from insulated wire

• The magnet is slowly pushed into the coil

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

• Flip the magnet around so the North pole is facing out
• Move the magnet back and forth
• Take the magnet out
• Add more coils around the paper cylinder

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 
• The magnet would explode 
• Electric current will flow through the wire
• It would produce a gravitational field

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A voltage is created in a wire when...

• it cuts through magnetic field lines

• it moves parallel to magnetic field lines

• it is stationary in a magnetic field

• a wire moves anywhere

Main difference between the motor effect and EM induction

• Motor effect: current + magnetic field = motion

  Induction: motion + magnetic field = current

• Motor effect: current + motion = magnetic field

  Induction: motion + magnetic field = current

• Motor effect: current + motion = magnetic field

  Induction: motion + magnetic field = no effect