You may want to review (Pages 821 822) PartA For help with math skills, you may

Question

You may want to review (Pages 821 822) PartA For help with math skills, you may want to review: Rearrangement of Equations Involving Multiplication and Division What magnetic field strength will levitate the 2.0 g wire in the figure(Figure 1)? Assume that I 1.6 A and d 11 cm Express your answer to two significant figures and include the appropriate units For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of The workings of a speaker IA ValueUnits Submit Request Answer Part B What is the direction of the magnetic field? Upward Downward Into the screen Out of the screen Figure 1 of 1 Previous Answers Correct 2.0 g wire B-field region Provide Feedback

Explanation / Answer

Answer:

Given, mass of the wire m = 2.0 g, current I = 1.6 A and d = 11 cm

(a) Magnetic force on a wire is F = IL x B.

In order to levitate the given force, the magnetic force has to be in the upward direction. Using Fleming's left hand rule, magnetic field B must have a component out of the page. The component of B parallel to the does not affect the force and is not determined. If the component of B which is perpendicular to the current, then B will point straight out of the page with a magnitude

            B = F/IL = mg /IL = (0.002 kg) (9.8 m/s2) / (1.6 A) (0.11 m) = 0.111 T.

(b) Out of the screen.

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