5. A narrow metal bar with resistance R and length is constrained to slide along metal rails with negligible resistance. There is a switch that can close in position A or position B. A uniform magnetic field with magnitude Bo points into the screen and occupies a region with width d. pull R L l d After the switch is closed, the metal bar is pulled to the left by a force Fpull such that it always travels with a constant speed vo through the magnetic field. a) Will Fpull do more work if the switch is closed in position A or in position B? b*) At the moment that the bar exits the region occupied by the magnetic field how much energy was dissipated in the resistor and how much energy is instantaneously stored in the inductor?

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### Physics Problem on Electromagnetic Induction

**Problem Statement:**
A narrow metal bar with resistance \( R \) and length \( \ell \) is constrained to slide along metal rails with negligible resistance. There is a switch that can close in position \( A \) or position \( B \). A uniform magnetic field with magnitude \( B_0 \) points into the screen and occupies a region with width \( d \).

After the switch is closed, the metal bar is pulled to the left by a force \( \vec{F}_{\text{pull}} \) such that it always travels with a constant speed \( v_0 \) through the magnetic field.

**Questions:**

a) Will \( \vec{F}_{\text{pull}} \) do more work if the switch is closed in position \( A \) or in position \( B \)?

b*) At the moment that the bar exits the region occupied by the magnetic field, how much energy was dissipated in the resistor, and how much energy is instantaneously stored in the inductor?

###  Diagram Explanation:

The diagram consists of a metal bar on rails within a magnetic field, with the following components labeled:
- The magnetic field is shown as a region with width \( d \), with field lines represented by crosses (\(\otimes\)) indicating the field points into the screen.
- A force \( \vec{F}_{\text{pull}} \) acts to the left on the metal bar.
- The metal bar has resistance \( R \) and length \( \ell \).
- A switch can close between positions \( A \) and \( B \).
- An inductor labeled \( L \) is present in the circuit.

### Analysis of the Problem:

**a) Force \( \vec{F}_{\text{pull}} \) Work Comparison:**

- **Position \( A \):** When the switch is in position \( A \), the circuit through the resistor \( R \) affects the work done.
- **Position \( B \):** When the switch is in position \( B \), the circuit includes the inductor \( L \), altering the work needed.

**b*) Energy Dissipation and Storage:**

- **Dissipation**: The energy dissipated in the resistor needs to be computed.
- **Storage**: Energy stored in the inductor \( L \) as a result of the current induced when the bar exits the
Transcribed Image Text:### Physics Problem on Electromagnetic Induction **Problem Statement:** A narrow metal bar with resistance \( R \) and length \( \ell \) is constrained to slide along metal rails with negligible resistance. There is a switch that can close in position \( A \) or position \( B \). A uniform magnetic field with magnitude \( B_0 \) points into the screen and occupies a region with width \( d \). After the switch is closed, the metal bar is pulled to the left by a force \( \vec{F}_{\text{pull}} \) such that it always travels with a constant speed \( v_0 \) through the magnetic field. **Questions:** a) Will \( \vec{F}_{\text{pull}} \) do more work if the switch is closed in position \( A \) or in position \( B \)? b*) At the moment that the bar exits the region occupied by the magnetic field, how much energy was dissipated in the resistor, and how much energy is instantaneously stored in the inductor? ### Diagram Explanation: The diagram consists of a metal bar on rails within a magnetic field, with the following components labeled: - The magnetic field is shown as a region with width \( d \), with field lines represented by crosses (\(\otimes\)) indicating the field points into the screen. - A force \( \vec{F}_{\text{pull}} \) acts to the left on the metal bar. - The metal bar has resistance \( R \) and length \( \ell \). - A switch can close between positions \( A \) and \( B \). - An inductor labeled \( L \) is present in the circuit. ### Analysis of the Problem: **a) Force \( \vec{F}_{\text{pull}} \) Work Comparison:** - **Position \( A \):** When the switch is in position \( A \), the circuit through the resistor \( R \) affects the work done. - **Position \( B \):** When the switch is in position \( B \), the circuit includes the inductor \( L \), altering the work needed. **b*) Energy Dissipation and Storage:** - **Dissipation**: The energy dissipated in the resistor needs to be computed. - **Storage**: Energy stored in the inductor \( L \) as a result of the current induced when the bar exits the
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