Motional EMF -- problem 7.7 in Griffith

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SUMMARY

The discussion focuses on problem 7.7 from Griffith's textbook regarding Motional Electromotive Force (EMF). The key points include the understanding that the magnetic force acting on a conductive bar does not perform work, thus maintaining a constant speed (v0). The energy dissipated in the resistor is calculated using the integral ∫i²R dt, addressing the confusion about the source of this energy. The participant seeks clarification on the relationship between magnetic force and energy dissipation in the resistor.

PREREQUISITES
  • Understanding of Motional EMF principles
  • Familiarity with magnetic forces and their properties
  • Basic knowledge of electrical circuits and resistors
  • Ability to perform calculus integrals, specifically ∫i²R dt
NEXT STEPS
  • Study the concept of Motional EMF in detail
  • Learn about the relationship between magnetic force and work
  • Explore energy dissipation in resistive circuits
  • Review calculus techniques for evaluating integrals
USEFUL FOR

Students studying electromagnetism, physics educators, and anyone looking to deepen their understanding of Motional EMF and energy dissipation in electrical circuits.

Pushoam
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Homework Statement


7.7.png

I need help in solving (c) and (d).

Homework Equations

The Attempt at a Solution


Since the force acting on the bar is Magnetic force and magnetic force does no work, the speed of the bar will remain same i.e. v0.
Question (d) is not making sense to me.
 
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Pushoam said:
Since the force acting on the bar is Magnetic force and magnetic force does no work, the speed of the bar will remain same i.e. v0.
Energy is being dissipated in the resistor. Where is this energy coming from?
 
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Pushoam said:
Question (d) is not making sense to me.
Compute the energy dissipated in the resistor as ∫i2R dt.
 

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