Select true or false for each statement below: 1. [ ] Magnetic fields are produc

Question

Select true or false for each statement below:

1. [ ] Magnetic fields are produced either by electric currents or time-varying electric fields.

2. [ ] Magnetic field lines, generated by a long straight wire carrying a current, are circles concentric with the wire and lie in planes perpendicular to the wire.

3. [ ] Parallel conducting wires carrying currents in the same direction repel each other.

4. [ ] Gauss’s law of magnetism states that the net magnetic flux through any closed surface is zero.

5. [ ] Unlike electric field lines, magnetic field lines are continuous and always form closed loops.

6. [ ] For an ideal solenoid, the interior magnetic field is uniform and the exterior field is zero.

7. [ ] The magnetic field inside a toroid is uniform.

Explanation / Answer

1. [True ] Magnetic fields are produced either by electric currents or time-varying electric fields.

2. [True ] Magnetic field lines, generated by a long straight wire carrying a current, are circles concentric with the wire and lie in planes perpendicular to the wire.

3. [False ] Parallel conducting wires carrying currents in the same direction repel each other.

4. [True ] Gauss’s law of magnetism states that the net magnetic flux through any closed surface is zero.

5. [ True] Unlike electric field lines, magnetic field lines are continuous and always form closed loops.

6. [ True] For an ideal solenoid, the interior magnetic field is uniform and the exterior field is zero.

7. [ False] The magnetic field inside a toroid is uniform.

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