SPM EN Phy – Magnetic Effect of a Current(I)

SPM EN Phy – Magnetic Effect of a Current(I)

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Question 1 of 15

1. Question
1 point(s)
Electric motors operate based on the effect of current-carrying conductors in a magnetic field.
- true
- false
Correct

Incorrect
Question 2 of 15

2. Question
1 point(s)
When a current-carrying conductor is placed in a magnetic field, the conductor experiences a force.
- true
- false
Correct

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Question 3 of 15

3. Question
1 point(s)
Magnetic fields from permanent magnets can combine with magnetic fields from current-carrying conductors.
- true
- false
Correct

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Question 4 of 15

4. Question
1 point(s)
The direction of the magnetic field is determined by Fleming\’s Left-Hand Rule.
- true
- false
Correct

Incorrect
Question 5 of 15

5. Question
1 point(s)
Direct current (DC) motors convert kinetic energy into electrical energy.
- true
- false
Correct

Incorrect
Question 6 of 15

6. Question
1 point(s)
Larger current produces a greater force on a conductor in a magnetic field.
- true
- false
Correct

Incorrect
Question 7 of 15

7. Question
1 point(s)
The strength of the magnetic field does not affect the force acting on a current-carrying conductor.
- true
- false
Correct

Incorrect
Question 8 of 15

8. Question
1 point(s)
A resultant field is a magnetic field produced only by a permanent magnet.
- true
- false
Correct

Incorrect
Question 9 of 15

9. Question
1 point(s)
DC motors have commutators and carbon brushes.
- true
- false
Correct

Incorrect
Question 10 of 15

10. Question
1 point(s)
The rotational speed of an electric motor increases with increasing current in the coil.
- true
- false
Correct

Incorrect
Question 11 of 15

11. Question
1 point(s)
Brushless motors do not have commutators and carbon brushes.
- true
- false
Correct

Incorrect
Question 12 of 15

12. Question
1 point(s)
Two opposing forces acting on a coil produce a rotational effect on the coil.
- true
- false
Correct

Incorrect
Question 13 of 15

13. Question
1 point(s)
Permanent magnetic fields are always moving.
- true
- false
Correct

Incorrect
Question 14 of 15

14. Question
1 point(s)
The rotation of a DC motor is produced by a pair of opposing magnetic forces.
- true
- false
Correct

Incorrect
Question 15 of 15

15. Question
1 point(s)
The influence of magnetic field strength on the force acting on a current-carrying conductor is negligible.
- true
- false
Correct

Incorrect