Electromagnetic Induction Problem

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SUMMARY

The discussion centers on solving an electromagnetic induction problem involving a 425 mA current induced in a 48.0 cm wire moving through a magnetic field. The magnetic force acting on the wire is 323 mN, leading to a calculated magnetic field strength of 1.583 T. The voltage across a connected 11.5 Ω resistor is determined to be 4.8875 V, which is then used to calculate the wire's velocity at 6.431 m/s. The participant expresses uncertainty about the direction of the induced EMF and the final calculations, but the steps taken are fundamentally correct.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with Ohm's Law (V=IR)
  • Knowledge of magnetic field calculations (B=F/IL)
  • Ability to apply the EMF equation (EMF=Blv)
NEXT STEPS
  • Review the concept of electromagnetic induction and Faraday's Law
  • Practice problems involving the calculation of induced EMF in different configurations
  • Explore the relationship between magnetic force and current-carrying conductors
  • Investigate the effects of angle (θ) in the EMF equation and its impact on induced voltage
USEFUL FOR

Students studying physics, particularly those focusing on electromagnetism, as well as educators looking for problem-solving techniques in electromagnetic induction scenarios.

paytona
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Homework Statement


A 425 mA conventional current is induced in a 48.0cm wire moved through a magnetic field. A 11.5 Ω resistor is connected to the wire as shown in the diagram below. If the magnetic force acting on the wire is 323 mN, then determine the direction and magnitude of the velocity of the wire moving through the magnetic field.
(Diagram is attached to this thread)

Homework Equations



B=F/IL
EMF=BlvsinΘ
V=IR

The Attempt at a Solution



My first step was to solve for the magnetic flux using B=F/IL
B= 323x10^-3 / (0.425A)(0.48m)
B= 1.5833333T

For my second step I found the Voltage of the current and resistor using V=IR
V=(0.425A)(11.5Ω)
V=4.8875V

For my third step I used V=Blv to solve for velocity
4.8875/[(1.583333T)(0.48m)= v
6.430934591m/s = v

and then I plugged it into the formula EMF=Blvsinθ
EMF=(1.58333)(0.48)(6.430934591)(sin90°)
EMF= 4.8875V

I know this is mostly wrong but I didn't know any other way to attempt this.
Please help!
 

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Why this doubt? I'd have done the same (except re-calculating emf at the end, perhaps).
Which step is tehe one you doubt the most ?
Apart from too many significant figures in the final answer, I do not see anything wrong in your solution.
 
BvU said:
Why this doubt? I'd have done the same (except re-calculating emf at the end, perhaps).
Which step is tehe one you doubt the most ?


Because I am missing direction. I feel I should use the voltage I get from solving for V as EMF to solve for velocity. I'm just very unsure about the actual EMF step and if the direction would be to right because the number is positive.
 

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