In a simple device for measuring the magnitude B of a magnetic field, a conducting rod (length d= 0,80 m, mass m = 180 g ) hangs from a friction- free pivot and is oriented so that its axis of rotation is aligned with the direction of the magnetic field to be measured. Thin flexible wires (which exert negligible force on the rod) carry a current I = 17 A, which causes the rod to deflect an angle with respect to the vertical, where it remains at rest (see the figure). (Figuro 1) Figure O O O O O S B 1 of 1 O ▾ Part B. If 0= 10°, determine B. Express your answer to two significant figures and include the appropriate units. B= Submit Part C Bux SM Value What is the largest magnetic field magnitude that can be measured using this device? Express your answer to two significant figures and include the appropriate units. Submit Request Answer Value Units Request Answer Units

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)

Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive. (μ0 = 4π × 10-7 T ∙ m/A) A) 2.7 × 10-5 N repulsive B) 7.2 × 10-5 N repulsive C) 3.4 × 10-5 N attractive D) 2.7 × 10-5 N attractive E) 7.2 × 10-5 N attractive

A wire with a weight per unit length of 0.083 N/m is suspended directly above a second wire. The top wire carries a current of 29.9 A and the bottom wire carries a current of 59.5 A. Find the distance of separation between the wires so that the top wire will be held in place by magnetic repulsion. Answer in mm.