Three very long, straight, parallel wires each carry currents of 20.5 A, directed into of the page. The wires pass through the vertices of a right isosceles triangle of side 18.5 cm. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle?

Two long parallel wires each carry a current of 5.7 A in opposite directions. The two wires are separated by 13 cm. What is the magnitude of the magnetic field ( in uT) at the midpoint between the wires?

Two coplanar and concentric circular loops of wire carry currents of I, = 5.10 A and I, = 2.90 A in opposite directions as in the figure below. (a) If r, = 12.0 cm and r, = 8.80 cm, what is the magnitude of the net magnetic field at the center of the two loops? (b) If r, = 12.0 cm and r, = 8.80 cm, what is the direction of the net magnetic field at the center of the two loops? O out of the page O into the page O toward the top of the page O toward the bottom of the page (c) Let r, remain fixed at 12.0 cm and let r, be a variable. Determine the value of r, such that the net field at the center of the loop is zero. cm

9 x 1021 electrons pass through the cross-section of a wire with a cross-sectional area of 9 mm2 in 1.4 minutes. What is the magnitude of the magnetic field formed at a distance of 36 cm from this wire? (Express your answer in the unit of µT)