a wire carries a current of 10A in the +x direction. a) Find the force per unit
ID: 2089853 • Letter: A
Question
a wire carries a current of 10A in the +x direction. a) Find the force per unit length on the wire if it is in a magnetic field that has components of Bx=.020T, By=.040T, and Bz=0T. b)Find the force per unit length on the wire if only the field's x-component is changed to Bx=.050T. c) Find the force per unit length on the wire if only the field's y-component is changed to By=-.050T.Explanation / Answer
a) Bx = 0.02T , By = 0.04T, Bz = 0T. as the current is moving in x- direction , only "y" and "z" components of the magnetic field produces force. Byz = sqrt(By^2+ Bz^2) = sqrt(0.04^2+0^2) = 0.04 T F = B * I * L sin(90)====> F/L = B*I = 0.04*10 = 0.4 N.................................... b) even Bx varies the force on wire does not change.......... c) Byz = sqrt(By^2+Bz^2) = sqrt(0.04^2+0.05^2) = 0.064T.... F/ L = B*I = 0.064*10 = 0.64N
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