What is the direction of the magnetic field that produces the magnetic force on a negative charge as shown in each of the three cases in the figures below, assuming B is perpendicular to v? (a) F --Select--- (b) Fin ---Select--- (c) |F -Select---

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What is the direction of the magnetic field that produces the magnetic force on a negative charge as shown in each of the three cases in the figures below, assuming B is perpendicular to v?

**Title: Determining the Magnetic Field Direction**

**Question:**
What is the direction of the magnetic field that produces the magnetic force on a negative charge as shown in each of the three cases in the figures below, assuming \( \mathbf{B} \) is perpendicular to \( \mathbf{v} \)?

---

**(a) Illustration Description:**
- A green arrow labeled \( \mathbf{v} \) pointing upwards represents the velocity of the negative charge.
- A red arrow labeled \( \mathbf{F} \) pointing left represents the magnetic force.
- Below the diagram, there is a dropdown labeled "Select".

**(b) Illustration Description:**
- A green arrow labeled \( \mathbf{v} \) pointing downwards represents the velocity of the negative charge.
- A red arrow labeled \( \mathbf{F} \) pointing into the page (shown as a circle with a cross) represents the magnetic force.
- Below the diagram, there is a dropdown labeled "Select".

**(c) Illustration Description:**
- A green arrow labeled \( \mathbf{v} \) pointing right represents the velocity of the negative charge.
- A red arrow labeled \( \mathbf{F} \) pointing upwards represents the magnetic force.
- Below the diagram, there is a dropdown labeled "Select".

**Explanation:**
In each case, the direction of the magnetic field \( \mathbf{B} \) needs to be determined using the right-hand rule adapted for a negative charge, where force direction is opposite. The right-hand rule states that if the thumb represents the velocity of a positive charge, and the fingers represent the magnetic field direction, the palm will represent the force direction. For negative charges, the force direction is reversed.
Transcribed Image Text:**Title: Determining the Magnetic Field Direction** **Question:** What is the direction of the magnetic field that produces the magnetic force on a negative charge as shown in each of the three cases in the figures below, assuming \( \mathbf{B} \) is perpendicular to \( \mathbf{v} \)? --- **(a) Illustration Description:** - A green arrow labeled \( \mathbf{v} \) pointing upwards represents the velocity of the negative charge. - A red arrow labeled \( \mathbf{F} \) pointing left represents the magnetic force. - Below the diagram, there is a dropdown labeled "Select". **(b) Illustration Description:** - A green arrow labeled \( \mathbf{v} \) pointing downwards represents the velocity of the negative charge. - A red arrow labeled \( \mathbf{F} \) pointing into the page (shown as a circle with a cross) represents the magnetic force. - Below the diagram, there is a dropdown labeled "Select". **(c) Illustration Description:** - A green arrow labeled \( \mathbf{v} \) pointing right represents the velocity of the negative charge. - A red arrow labeled \( \mathbf{F} \) pointing upwards represents the magnetic force. - Below the diagram, there is a dropdown labeled "Select". **Explanation:** In each case, the direction of the magnetic field \( \mathbf{B} \) needs to be determined using the right-hand rule adapted for a negative charge, where force direction is opposite. The right-hand rule states that if the thumb represents the velocity of a positive charge, and the fingers represent the magnetic field direction, the palm will represent the force direction. For negative charges, the force direction is reversed.
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