Question
Activity A: Observing induction Get the Gizmo ready: Set the Current to 0 amps. Goal: Use compasses to determine the direction of magnetic field induced by a current in a wire. 1. Predict: Place the compasses in a circle around the wire as shown at right. What do you think will happen as you slowly drag the Current slider all the way to the right? square
Answer
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Nigel
Master · Tutor for 5 years
Answer
#Explanation#The question is about the magnetic field induced by a current in a wire. According to Ampere's circuital law, a current-carrying wire induces a magnetic field around it. The direction of this magnetic field is given by the right-hand rule, which states that if you point your thumb in the direction of the current, your fingers will curl in the direction of the magnetic field. In this case, if you place compasses around the wire, they will align themselves with the magnetic field. As you increase the current (by dragging the Current slider to the right), the strength of the magnetic field will also increase. This will cause the needles of the compasses to deflect more. The direction of deflection will depend on the direction of the current.#Answer#As you slowly drag the Current slider all the way to the right, increasing the current, the compasses placed in a circle around the wire will show greater deflection. This is because the strength of the magnetic field induced by the current in the wire increases, causing the compass needles to align more with the magnetic field. The direction of the deflection will be in line with the right-hand rule.