### Correct Option: C. To the left ### Detailed Explanation: To determine the direction of the magnetic force experienced by a straight current-carrying conductor in a magnetic field, we can use the **right-hand rule**. This rule is a helpful mnemonic for visualizing the relationship between the direction of the current, the magnetic field, and the resulting force on the conductor. #### Step-by-Step Application of the Right-Hand Rule: 1. **Identify the Directions**: - The current is flowing from **left to right**. - The magnetic field is directed **upwards**. 2. **Using the Right-Hand Rule**: - Extend your right hand. - Point your thumb in the direction of the current (which is from left to right). - Point your fingers in the direction of the magnetic field (which is upwards). - Your palm will then face in the direction of the magnetic force acting on the conductor. 3. **Resulting Direction**: - When you apply the right-hand rule as described, your palm will face **to the left**. This indicates that the magnetic force acting on the conductor is directed to the left. ### Why the Other Options Are Incorrect: - **Option A: Downward**: This option suggests that the force is directed downward. However, according to the right-hand rule, the force is not downward when the current is flowing from left to right and the magnetic field is upwards. - **Option B: Upward**: This option implies that the force is directed upward. Again, using the right-hand rule, we see that the force is not in the same direction as the magnetic field; hence, this option is incorrect. - **Option D: To the right**: This option suggests that the force is directed to the right. However, since the current is already flowing to the right, the force cannot also be in that direction when the magnetic field is upwards. The right-hand rule clearly shows that the force is to the left. ### Summary of Key Concepts: - **Right-Hand Rule**: A method to determine the direction of the magnetic force on a current-carrying conductor. - **Current Direction**: The direction of the current is indicated by the thumb of the right hand. - **Magnetic Field Direction**: The direction of the magnetic field is indicated by the fingers of the right hand. - **Force Direction**: The direction of the magnetic force is indicated by the palm of the right hand. ### Revision Summary: - Use the right-hand rule to find the direction of the magnetic force on a current-carrying conductor. - Thumb = Current direction; Fingers = Magnetic field direction; Palm = Force direction. - For a current flowing left to right and a magnetic field directed upwards, the force is directed to the left. - Remember that the force direction is perpendicular to both the current and the magnetic field.