Which of the following statements about uniform and non-uniform magnetic fields

Question

Which of the following statements about uniform and non-uniform magnetic fields are true?

For full credit, mark all true statements and none of the false statements and explain briefly your reasoning in the space below each statement.

The net force on a current loop in a non-uniform magnetic field is zero.

The net force on a current loop in a uniform magnetic field is zero.

Moving electric charges produce magnetic fields in their neighborhood.

Moving electric charges produce uniform magnetic fields.

Current carrying wires produce magnetic fields in their neighborhood, which point radially away from the wire.

Current carrying wires produce magnetic fields in their neighborhood and the resulting field vector B at some point P is perpendicular to the distance vector r between the field causing wire element dl and the point P.

Explanation / Answer

1) False. because, The force on 4 segments is not same, relulting a net force on the loop.

2) True. Force on 4 segments will be same.

3) true. whenver current flow, it produces magnetic field.

4) False. They can not produce uniform magnetic field.

because, B = mue*I/(2*pi*d)

so, as d increases B decreases.

5) False. magnetic field lines are closed loops around the wire.

6) True. magnetic field lines are closed loops around the wire.

so, r and B are always perpendicualr.

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