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A light bulb of resistance R is placed at a distance w away from a uniform magnetic field region of magnitude B pointing out of the page. The lightbulb is connected to two conducting rails with width d as shown in the right figure. A conducing bar of length L and mass m is placed on the conducting rail, at the left edge of the magnetic field region. The bar is then given an initial velocity v; to the right. In below, express your answers in terms of R, B, w, L, d, m and/or Vị. Note that you may ot need all the variables at the same time. Vi At the initial moment, when the bar still has a velocity vi, find the electric current flowing (a) through the light bulb. (Also specify the direction).

A light bulb of resistance R is placed at a distance w away from a uniform magnetic field region of magnitude B pointing out of the page. The lightbulb is connected to two conducting rails with width d as shown in the right figure. A conducing bar of length L and mass m is placed on the conducting rail, at the left edge of the magnetic field region. The bar is then given an initial velocity v; to the right. In below, express your answers in terms of R, B, w, L, d, m and/or Vị. Note that you may ot need all the variables at the same time. Vi At the initial moment, when the bar still has a velocity vi, find the electric current flowing (a) through the light bulb. (Also specify the direction).

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A light bulb of resistance R is placed at a distance w away from a uniform magnetic field region of magnitude B pointing out of the page. The lightbulb is connected to two conducting rails with width d as shown in the right figure. A conducing bar of length L and mass m is placed on the conducting rail, at the left edge of the magnetic field region. The bar is then given an initial velocity v; to the right. In below, express your answers in terms of R, B, w, L, d, m and/or Vị. Note that you may not need all the variables at the same time. d Vi (a) through the light bulb. (Also specify the direction). At the initial moment, when the bar still has a velocity vi, find the electric current flowing (b) direction and the magnitude. At that same moment, find the magnetic force acted on bar. Remember to include both the (c) the total energy dissipated by the light bulb throughout the entire process. Suppose the magnetic field region is long enough so that the bar eventually comes to rest. Find
Transcribed Image Text:A light bulb of resistance R is placed at a distance w away from a uniform magnetic field region of magnitude B pointing out of the page. The lightbulb is connected to two conducting rails with width d as shown in the right figure. A conducing bar of length L and mass m is placed on the conducting rail, at the left edge of the magnetic field region. The bar is then given an initial velocity v; to the right. In below, express your answers in terms of R, B, w, L, d, m and/or Vị. Note that you may not need all the variables at the same time. d Vi (a) through the light bulb. (Also specify the direction). At the initial moment, when the bar still has a velocity vi, find the electric current flowing (b) direction and the magnitude. At that same moment, find the magnetic force acted on bar. Remember to include both the (c) the total energy dissipated by the light bulb throughout the entire process. Suppose the magnetic field region is long enough so that the bar eventually comes to rest. Find
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