Question

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, and then find an equation for it (in terms of current, wire length L, and d).

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

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

Answer 1