### Magnetic Force Measurement Using a Current Balance A current balance is a device used to measure magnetic forces. It is composed of two parallel coils, each with an average radius of 12.5 cm. - **Lower Coil**: - Rests on a balance. - Contains 20 turns of wire. - Carries a constant current of 3.10 A. - **Upper Coil**: - Suspended 0.314 cm above the lower coil. - Contains 50 turns of wire. - Has a variable current. The balance reading varies with the magnetic force exerted on the lower coil. The task is to determine the current needed in the upper coil to exert a force of 1.50 N on the bottom coil. #### Diagram Explanation 1. **Ammeter**: Measures the current in the circuit. 2. **Variable DC Power Supply**: Adjusts the current in the upper coil. 3. **DC Power Supply**: Provides a constant current to the lower coil. 4. **Stand with Clamp**: Supports the upper coil. 5. **Plate**: Supports the lower coil resting on the balance. 6. **Triple Beam Balance**: Measures the weight and force exerted on the lower coil. 7. **Wire Wrapped Around Disk**: The coils are formed by wire turns, inducing magnetic fields. The configuration allows the measurement of forces between the coils, providing insight into magnetic interactions and current effects.
### Magnetic Force Measurement Using a Current Balance A current balance is a device used to measure magnetic forces. It is composed of two parallel coils, each with an average radius of 12.5 cm. - **Lower Coil**: - Rests on a balance. - Contains 20 turns of wire. - Carries a constant current of 3.10 A. - **Upper Coil**: - Suspended 0.314 cm above the lower coil. - Contains 50 turns of wire. - Has a variable current. The balance reading varies with the magnetic force exerted on the lower coil. The task is to determine the current needed in the upper coil to exert a force of 1.50 N on the bottom coil. #### Diagram Explanation 1. **Ammeter**: Measures the current in the circuit. 2. **Variable DC Power Supply**: Adjusts the current in the upper coil. 3. **DC Power Supply**: Provides a constant current to the lower coil. 4. **Stand with Clamp**: Supports the upper coil. 5. **Plate**: Supports the lower coil resting on the balance. 6. **Triple Beam Balance**: Measures the weight and force exerted on the lower coil. 7. **Wire Wrapped Around Disk**: The coils are formed by wire turns, inducing magnetic fields. The configuration allows the measurement of forces between the coils, providing insight into magnetic interactions and current effects.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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Transcribed Image Text:### Magnetic Force Measurement Using a Current Balance
A current balance is a device used to measure magnetic forces. It is composed of two parallel coils, each with an average radius of 12.5 cm.
- **Lower Coil**:
- Rests on a balance.
- Contains 20 turns of wire.
- Carries a constant current of 3.10 A.
- **Upper Coil**:
- Suspended 0.314 cm above the lower coil.
- Contains 50 turns of wire.
- Has a variable current.
The balance reading varies with the magnetic force exerted on the lower coil. The task is to determine the current needed in the upper coil to exert a force of 1.50 N on the bottom coil.
#### Diagram Explanation
1. **Ammeter**: Measures the current in the circuit.
2. **Variable DC Power Supply**: Adjusts the current in the upper coil.
3. **DC Power Supply**: Provides a constant current to the lower coil.
4. **Stand with Clamp**: Supports the upper coil.
5. **Plate**: Supports the lower coil resting on the balance.
6. **Triple Beam Balance**: Measures the weight and force exerted on the lower coil.
7. **Wire Wrapped Around Disk**: The coils are formed by wire turns, inducing magnetic fields.
The configuration allows the measurement of forces between the coils, providing insight into magnetic interactions and current effects.
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