*40. GO A horizontal wire is hung from the ceiling of a room by two massless strings. The wire has a length of 0.20 m and a mass of 0.080 kg. A uniform magnetic field of magnitude 0.070 T is directed from the ceiling to the floor. When a current of I = 42 A exists in the wire, the wire swings upward and, at equilibrium, makes an angle with respect to the vertical, as the drawing shows. Find (a) the angle and (b) the tension in each of the two strings. N S 160

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### Problem Statement

A horizontal wire is hung from the ceiling of a room by two massless strings. The wire has a length of 0.20 m and a mass of 0.080 kg. A uniform magnetic field of magnitude 0.070 T is directed from the ceiling to the floor. When a current \( I = 42 \) A exists in the wire, the wire swings upward and, at equilibrium, makes an angle \(\phi\) with respect to the vertical, as shown in the figure. Find:
(a) the angle \(\phi\), and 
(b) the tension in each of the two strings.

### Diagram Explanation
The diagram illustrates the setup of the problem with the following components:

1. **Ceiling and Floor with Magnetic Field**: The diagram shows a room with a ceiling and a floor. The magnetic field (\(\mathbf{B}\)) is uniform and directed from the ceiling (N) to the floor (S). The field lines are shown as red arrows indicating the direction from the ceiling to the floor.

2. **Wire**: A horizontal wire of length \( l \) is suspended in equilibrium by two massless strings. The wire is subjected to a magnetic field and carries a current \( I \).

3. **Angle \(\phi\)**: The wire makes an angle \(\phi\) with the vertical due to the magnetic force acting on it. The angle is depicted in the diagram.

4. **Current Direction**: The current \( I \) in the wire is shown to be horizontally directed.

### Calculation Components
To solve the problem, the following concepts and equations would be utilized:

1. **Magnetic Force on the Wire**:
   \[
   F = I l B \sin(\theta)
   \]
   In this case, the angle between the current direction and magnetic field is 90 degrees (\(\theta = 90^\circ\)), simplifying the expression to:
   \[
   F = I l B
   \]

2. **Forces in Equilibrium**:
   - Vertical equilibrium condition: The sum of the forces in the vertical direction must be zero.
   - Horizontal equilibrium condition: The sum of the forces in the horizontal direction must be zero.

3. **Tension in Strings**:
   Each string will have a vertical and horizontal component of tension balancing the weight of the wire and the magnetic force respectively.

By analyzing these conditions, both the
Transcribed Image Text:### Problem Statement A horizontal wire is hung from the ceiling of a room by two massless strings. The wire has a length of 0.20 m and a mass of 0.080 kg. A uniform magnetic field of magnitude 0.070 T is directed from the ceiling to the floor. When a current \( I = 42 \) A exists in the wire, the wire swings upward and, at equilibrium, makes an angle \(\phi\) with respect to the vertical, as shown in the figure. Find: (a) the angle \(\phi\), and (b) the tension in each of the two strings. ### Diagram Explanation The diagram illustrates the setup of the problem with the following components: 1. **Ceiling and Floor with Magnetic Field**: The diagram shows a room with a ceiling and a floor. The magnetic field (\(\mathbf{B}\)) is uniform and directed from the ceiling (N) to the floor (S). The field lines are shown as red arrows indicating the direction from the ceiling to the floor. 2. **Wire**: A horizontal wire of length \( l \) is suspended in equilibrium by two massless strings. The wire is subjected to a magnetic field and carries a current \( I \). 3. **Angle \(\phi\)**: The wire makes an angle \(\phi\) with the vertical due to the magnetic force acting on it. The angle is depicted in the diagram. 4. **Current Direction**: The current \( I \) in the wire is shown to be horizontally directed. ### Calculation Components To solve the problem, the following concepts and equations would be utilized: 1. **Magnetic Force on the Wire**: \[ F = I l B \sin(\theta) \] In this case, the angle between the current direction and magnetic field is 90 degrees (\(\theta = 90^\circ\)), simplifying the expression to: \[ F = I l B \] 2. **Forces in Equilibrium**: - Vertical equilibrium condition: The sum of the forces in the vertical direction must be zero. - Horizontal equilibrium condition: The sum of the forces in the horizontal direction must be zero. 3. **Tension in Strings**: Each string will have a vertical and horizontal component of tension balancing the weight of the wire and the magnetic force respectively. By analyzing these conditions, both the
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