Question

"Wire Float": floating wire class problem. Two wires carry current I out of the page, while a top wire carries current I into the page. The wires are at corners of an equilateral triangle of sides d=5.00 mm, and have linear mass density 40.0 g/m.

a) What is B at the top wire? Find it graphically.

b) Now find an equation for B (in terms of current, wire length L, and d).

c) What is the magnetic force on the top wire (in terms of current, wire length L, and d)?

d) What must the current I be, to make the top wire float? You can get an actual number here.

Answer 1