Please explain separately for both a and b please! (7) 18 points] A 0.50 m long,

Question

Please explain separately for both a and b please! (7) 18 points] A 0.50 m long, 12.0 N metal bar rests on, but is not attached to, two metal supports as shown in the figure The bar is completely in a constant edernal uniform magnetic field. When 6.0 A is running through the bar, the bar pushes on the rails with a net force of 22.0 N. Show your work! (a) B points) Which way (left, right, up, down, into, or out of the page) doces the extermal magnetic field point? Explain how you can tel. (b) [5 points] What is the magnitude of the external magnetic field? Answer (7b)

Explanation / Answer

magnetic force acting on a current carrying rod = Fb = i * ( L cross B)

here current is flowing from left to right

the direction of l is taken as +i

given the rod is pushing the rails

Fb is in down ward (-j)

from the expression

Fb = i* ( L cross B)

B is out of the page <-------answer

part(B)

Fnet = Fb + Fg

22 = Fb + 12

Fb = 10 N

L and B are at 90 degrees seperation

Fb = i*L*B

B = Fb/iL = 10/(6*0.5) = 10/3 = 3.33 T <<<---answerr

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