物理gogogo

Which rule can determine the direction of magnetic force acting on the current-carrying conductor?

• Fleming's Left-hand Rule

• Fleming's Right-hand rule

• Right-hand grid Rule

• 双枪会给出答案

Which rule can determine the direction of induced current in the current-carrying conductor?

• Fleming's Left-hand Rule

• Fleming's Right-hand Rule

• Right-hand grid Rule

• 双枪会给出答案

Which rule can determine the direction of induced current in the solenoid?

• Fleming's Left-hand Rule

• Fleming's Right-hand Rule

• Right-hand grid Rule

• 双枪会给出答案

What is the factors affecting the magnitude of the force acting on a current-carrying conductor in magnetic field?

• Colour of conductor

• Magnitude of current

• Thickness of conductor

• The owner of conductor

What is the factors affecting the speed of rotation of an electric motor?

• Number of turns of wire coil

• direction of current

• Shape of wire coil

• Magnitude of current

The current flow to W. Which direction of the conductor will move?

• W

• X

• Y

• Z

What happen to the coil when the switch is turned on?

• Remains stationary

• Rotates anti-clockwise

• Rotates clockwise

• Rotates and stops with vertical position

What is the advantage of using brushless motor?

• Motor is able to rotate faster.

• There is no contact between the brush and the commutator.

• There is an increase in current flow.

• There is less friction.

The flow of current in a solenoid produces a magnetic field. Which of the following factors does not affect the strength of the magnetic field?

• The number of turns in the solenoid

• The magnitude of the current flow

• The direction of current flow

• The existence of iron core in the solenoid

What will happen to the magnet bar when the switch is closed?

• Not moving

• Move away from the solenoid

• Move towards the solenoid

• Swing to the right and to the left