Write the set letter and questionnaire number above booklet.Solve the following

Question

Write the set letter and questionnaire number above booklet.Solve the following problems. One page per problem, Solutions, Draw figures if necessary. A horizontal -straight wire of length 1.50 m carries a Current of 12.0 A In the south to north direction, (a) Find the magnitude and direr lion of the magnetic field due to the wire at point P, 20.0 cm directly above the wire along its. perpendicular bisector. (b) At the instant an electron with a velocity of 5.00 times 10^6 m/s, southward is at point P, What are the magnitude and direction of the magnetic force exerted by the wire on It?

Explanation / Answer

B = uo I/ 2pi r

= 4 Pi * 10^-7 ( 12)/ 2pi ( 0.2)

=1.2 * 10^-5 T

along +y direction

(b)

F = Bqv sin theta = 1.2 * 10^-5 ( 1.6 * 10^-19)(5 * 10^6) sin90 = 9.6 * 10^-18 N

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