Problem 1.
Two long straight wires carrying the same current I and separated by a distance r exert a force F on each other. The current is increased to 4I and the separation is reduced to r/6 . What will be the force between two wires?
Solution
Problem 2.
Two long straight wires carrying the same current 15 A exert a force of 0.001 N per unit length on each other. What is the distance between the wires?
Solution
Problem 20.
A square loop 4 cm on each side carriers a 0.2 A current. The loop is in 0.5 T magnetic field and an angle between the direction of the magnetic field and the plane of the loop is . What is the magnitude of the torque on the current loop?
Solution
Problem 21.
What is the magnitude of a torque on a square loop shown in the figure?.
Solution
Problem 22.
A cross section through three long wires with linear mass density of 2 g/m is shown in the figure. They each carry equal currents. The lower two wires are attached to a table, while the third wire is free to move. What current will allow the third wire to float so as to form an equilateral triangle with two other wires?
Solution
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