(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The figure shows a zero-resistance rod sliding to the right on two zero-resistance rails separated by the distance L = 0.53 m. The rails are connected by a 10.9-Ω resistor, and the entire system is in a uniform magnetic field with a magnitude of 0.750 T.

(a) Find the force that must be exerted on the rod to maintain a constant current of 0.125 A in the resistor.

(b) What is the rate of energy dissipation in the resistor?

(c) What is the mechanical power delivered to the rod?

2. Relevant equations

a.) F=I x B x length

b.) P=I^2 x R

c.) P= F x velocity

3. The attempt at a solution

This sort of problem has not been covered in lecture yet and I am having difficulties with it. I found these formulas in the book and I think they apply for these situations but I am not sure. For part A of the problem I tried plugging in .125A for the current, .53m for the length, and .750T for the magnitude. Which gave me F=(.125)(.750)(.53)=.05 . This answer is off by a multiple of 10. I'm assuming my mistake is with the units of B because I have not worked with this before. Any help would be appreciated, thanks

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# Homework Help: Ampere's Law and Magnetic Fields

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