How would I calculate the voltage

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To calculate the voltage across the resistor in the given scenario, the magnetic field strength (B) can be derived using the formula F = BIL, where F is the force acting on the rod. Given the current (I) of 0.034 A and the length (L) of the rod at 0.18 m, B can be calculated as approximately 1601 T. Once B is known, voltage (V) can be calculated using V = BvL, resulting in a voltage of around 461.19 V. An alternative method to find voltage is using Ohm's Law, V = IR, which may simplify the calculation without needing the magnetic field strength directly. The discussion highlights the relationship between current, resistance, and voltage in the context of electromagnetic induction.
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Homework Statement


A 0.18m long metal rod is places on some metal rollers in a megnetic field directed into the page. When the rod is moved left with a speed of 1.6ms-1, a current of 0.034 A is measured through the 25Ω resistor.
How would I calculate the voltage when I'm not given the magnetic field strength? V=BvL


Homework Equations


F=BI:
F=Bvq
V=Bvl

The Attempt at a Solution


F=BIL
= 9.8=B*0.034*0.18
B=9.7/(0.034*0.18)
=1601T

V=BvL
V=1601*1.6*0.18
=461.19V..

I'm not sure if you can use 9.8 for the force,
please help
 
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hi mnishi96! welcome to pf! :smile:
mnishi96 said:
How would I calculate the voltage when I'm not given the magnetic field strength?

can't you just use V = IR ?
 

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