A thin copper rod 1.0 m long has a mass of 0.050 kg and is ina magnectic field of 0.10 T. What minimum current in the rodis needed in order fot the magnetic force to cancel the weight ofthe rod?

mattgondek4

mattgondek4

Answered question

2020-10-27

A thin copper rod 1.0 m long has a mass of 0.050 kg and is ina magnectic field of 0.10 T. What minimum current in the rodis needed in order fot the magnetic force to cancel the weight ofthe rod?

Answer & Explanation

rogreenhoxa8

rogreenhoxa8

Skilled2020-10-28Added 109 answers

F=mg 
ILBsinθ=mg 
I=mgLBsinθ 
 LBsinθ 
θ=90 
I=mgLBsin(90)=mgLB=(0.050)(9.80)(1.00)(0.10)=4.9A

Jeffrey Jordon

Jeffrey Jordon

Expert2021-09-29Added 2605 answers

We have length of rod , l=1 m

Mass of rod , m=50×103 kg

Magnetic Field , B=0.1 T

Fm(magnetic force)=i×l×B

 

Fm=w=mg, ilB=mg

So,

i=mgBl=50×103×9.80.1×1=4.9A

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