Consider a hemisphere present in a magnetic field. Which of the following is true regarding the magnetic flux through the dome of the hemisphere?   a. It is affected by the component of the magnetic field tangential to the direction of the circular base.   b. It is affected by the component of the magnetic field tangential to the circular base.   c. It is affected by the component of the magnetic field tangential to the dome.   d. The answer can be found on more than one of the other choices.

Which of the following would give the largest torque in a magnetic field if the current through each is the same. A. a circular loop, radius 6 cm B. 10 circular loops, radius 2 cm C. a rectangular loop 8 cm × 10 cm D. 20 rectangular loops, each 2 cm × 3 cm

Which one of the following statements is true? A. Like positive and negative charges, science has been able to separate north and south magnetic poles. B. Science has been able to separate a north magnetic pole from a south magnetic pole, but not a south magnetic pole from a north magnetic pole. C. Unlike positive and negative charges, science has never been able to separate north and south magnetic poles. D. Science has been able to separate a south magnetic pole from a north magnetic pole, but not a north magnetic pole from a south magnetic pole.

13. Two infinitely long wires are placed as shown in the figure on the right, with h = 120 A placed at x = 0, and 2 = 55.0 A placed at x = a = 15.0 cm. %3D a) Calculate the magnitude of the force per unit length these wires exert on each other and specify the direction in which the force is acting on each wire. b) At what location on the x axis is the total magnetic field due to the two wires equal to zero?