April 9, 2019 hwmadeeasy Two infinitely long parallel wires carry currents of equal magnitude. What is the resultant magnetic field due to the two wires at a point midway between the wires, compared with the magnetic field due to one of them alone, if the currents are (a) in the same direction and (b) in opposite directions?

April 9, 2019 hwmadeeasy Exercise 5-5: A square coil of 100 turns and 0.5 m long sides is in a region with a uniform magnetic flux density of 0.2 T. If the maximum magnetic torque exerted on the coil is 4×10 −2 ( N·m), what is the current flowing in the coil?

April 9, 2019 hwmadeeasy Exercise 5-4: A horizontal wire with a mass per unit length of 0.2 kg/m carries a current of 4 A in the +x direction. If the wire is placed in a uniform magnetic flux density B, what should the direction and minimum magnitude of B be in order to magnetically lift the wire vertically upward? [Hint: The acceleration due to gravity is g = −ˆz 9.8 m/s2 . ] Answer: B = ˆy0.49 T.

April 9, 2019 hwmadeeasy Concept Question 5-2: The ends of a 10 cm long wire carrying a constant current I are anchored at two points on the x axis, namely x = 0 and x = 6 cm. If thewire lies in the x–y plane in a magnetic field B = ˆyB0 , which of the following arrangements produces a greater magnetic force on the wire: (a) wire is V-shaped with corners at (0, 0), (3, 4), and (6, 0), (b) wire is an open rectangle with corners at (0, 0), (0, 2), (6, 2), and (6, 0).

April 9, 2019 hwmadeeasy Exercise 5-3: A charged particle with velocity u is moving in a medium with uniform fields E = ˆxE and B = ˆyB. What should u be so that the particle experiences no net force?

April 9, 2019 hwmadeeasy Exercise 5-2: A proton moving with a speed of 2 × 10m /s through a magnetic field with magnetic flux density of 2.5 T experiences a magnetic force of magnitude 4 × 10 −13 N . What is the angle between the magnetic field and the proton’s velocity?

April 9, 2019April 9, 2019 hwmadeeasy An electron moving in the positive x direction perpendicular to a magnetic field is deflected in the negative z direction. What is the direction of the magnetic field?

April 9, 2019April 9, 2019 hwmadeeasy What are themajor differences between the electric force Fe a nd the magnetic force Fm ?