four compasses are placed around a wire, as shown. what is the best conclusion that can be drawn? a current…

four compasses are placed around a wire, as shown. what is the best conclusion that can be drawn? a current flows up the wire. a current flows down the wire. a current flows, but its direction cannot be known. a current does not flow in the wire.

four compasses are placed around a wire, as shown. what is the best conclusion that can be drawn? a current flows up the wire. a current flows down the wire. a current flows, but its direction cannot be known. a current does not flow in the wire.

Answer

Explanation:

Step1: Recall magnetic - field due to current - carrying wire

A current - carrying wire produces a magnetic field around it which can deflect a compass needle. Since the compass needles are deflected, a current must be flowing in the wire.

Step2: Analyze direction information

The given figure only shows that the compass needles are deflected, but there is no information (such as the orientation of the Earth's magnetic field or the use of the right - hand rule with a known reference) to determine the direction of the current.

Answer:

A current flows, but its direction cannot be known.