Problem 5. (10 points). A current balance is constructed in the following way: A

Question

Problem 5. (10 points). A current balance is constructed in the following way: A 20-cm- long section of wire is placed on top of the pan of an electronic balance used in a chemistry lab. Leads are clipped to it running into a power supply and through the supply to another segment of wire that is suspended directly above it, parallel with it (See figure below.) The distance between the two wires is L 2.0 cm. The power supply provides a current I running through the wires. When the power supply is switched on, the reading on the balance increases by 3.0 mg (1 mg -106 kg). What is the current running through the wire? Power supply Wire supports Electronic balance

Explanation / Answer

force = mg =3 x10-6 x 9.8 =29.4uN

Bilsin(theta) = force

B=ui/4pil and u/4pi=10-7

29.4uN = 10-7 x i2

i=17.14A

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