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hw7key - HW7Key 1.A conductor consists of a circular loop...

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1 1.A conductor consists of a circular loop of radius R and two straight, long sections as shown in the figure. The wire lies in the plane of the paper and carries a current I. Find an expression for the vector magnet field at the center of the loop. Step 1, formulas or related concepts.] line: and loop: Step 2, known quantities. The wire lies in the plane of the paper and carries a current I Step 3, direct application of the formulas/concept or the condition to form an equation. 0 0 0 (1 ) 2 2 2 loop line I I I B B B R R R μ μ μ π π π + = + = + = HW7Key Step 4, vector involved? Yes Step 5, unit in the final answer correct? Answered all were asked? Yes, All questions answered. The direction of B is away from you and go into the paper
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2 Step 1, formulas or related concepts.] Step 2, known quantities. Step 3, direct application of the formulas/concept or the condition to form an equation. The force on longer border on the left hand side is: (this force points to left) HW7Key 2. Shown in the figure the current in the long, straight wire is
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