Which of the following does not influence the strentgh of electromagnet?

• Number of turns of wire

• Magnitude of current flow in the wire

• Type of core

• Material used for insulator of the wire

Diagram above shows a solenoid. Which of the following rules may be used to determine the direction of the current in the coil?

• Fleming’s Left Hand Rule

• Fleming’s Right Hand Rule

• Right Hand Screw Rule

• Right Hand Grip Rule

Tags

NGSS.HS-PS2-5

Diagram above 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?

• Use a thinner wire to form the coils

• Use a non-insulated wire to form the coils

• Reduce the number of coils

• Increase the magnitude of current

Diagram above shows the apparatus used to set-up to observe the magnetic field due to a current in a coil.

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Diagram above shows a conductor wire placed in a magnetic field. When the switch is on, the conductor wire initially moves towars..

• W

• X

• Y

• Z

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

• J

• K

• L

• M

Diagram above shows an electric motor. The magnitude of force F increses when..

• The number of turns of the wire coil decreases

• The magnitude of the electric current decreases

• The magnitude of magnetic fields decreases

• The resistance of the wire coil decreases

Diagram above shows a left hand which represents the Fleming’s Left Hand Rule. X represents ....

• Motion

• Electric current

• Magnetic field

• Potential difference

Diagram above shows a conductor placed inside a magnetic field. What is the direction of motion of the conductor when the current flows ?

• W

• X

• Y

• Z

Diagram above 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?

• Use a stronger magnet

• Use a thicker conductor

• Increase the number of batteries

• Increase the distance between magnets