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Electromagnetism Question

  • Thread starter Destrio
  • Start date
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1. Homework Statement
A loop of wire of aream 0.32m^2 is palced in a 0.75 T magnetic field. The magnetic field is changed to 0.35 T in the opposite direction in 0.45 s . What is the magnitude of the current through the 15 ohm resistor.


2. Homework Equations
emf = -N (flux / time)


3. The Attempt at a Solution

emf = (-1) [(.35T)(.32m^2)-(.75T)(.32m^2)]/(.45s)
emf = .284 V
V = IR
I = .284 V / 15ohm
I = .019 A

.019 is the wrong answer in the multiple choice
the correct answer is supposed to be 0.052 A

Thanks
 

Answers and Replies

OlderDan
Science Advisor
Homework Helper
3,021
2
1. Homework Statement
A loop of wire of aream 0.32m^2 is palced in a 0.75 T magnetic field. The magnetic field is changed to 0.35 T in the opposite direction in 0.45 s . What is the magnitude of the current through the 15 ohm resistor.


2. Homework Equations
emf = -N (flux / time)


3. The Attempt at a Solution

emf = (-1) [(.35T)(.32m^2)-(.75T)(.32m^2)]/(.45s)
emf = .284 V
V = IR
I = .284 V / 15ohm
I = .019 A

.019 is the wrong answer in the multiple choice
the correct answer is supposed to be 0.052 A

Thanks
Looks like you have not computed the change in field correctly.
 

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