Physics

Problem

2. The conventional current I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on the proton is: A)

\frac{\mu_{o}}{2 \pi} \frac{I^{2} L}{R}

upward (in the same direction as I) B)

\frac{\mu_{o}}{2 \pi} \frac{I^{2} L}{R}

downward (in the opposite direction as I) ![](https://storage.googleapis.com/diraq-contents/question-bank/question-images/207abbd654af/2025_11_20_a06764ffad9cea2721f0g-01.jpg) C)

\quad e v \frac{\mu_{o}}{2 \pi} \frac{I}{R}

upward (in the same direction as I) D)

\quad e v \frac{\mu_{o}}{2 \pi} \frac{I}{R}

downward (in the opposite direction as I)

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