A 6.75 g wire of length L 15.0 cm is suspended by a pair of flexible leads in a uniform magnetic field of magnitude 0.440 T (Fig. 28-30). What are the (a) magnitude and (b) direction (left or right) of the current required to remove the tension in the supporting leads? Please explain the solution step by step

If the potential difference over a length of copper wire is 1.5 V, how long must the copper wire be so that when placed in the magnetic field of the Earth at the equator, the copper wire will levitate? In which direction (North, South, East, or West) must the current flow in the wire in order to pull off this trick? Can this be done at the North or South Pole?

A uniform magnetic field points vertically upward; its magnitude is 0.520 T. An electron with kinetic energy 6.50 × 10−18 J is moving horizontally eastward in this field. What is the magnetic force acting on it? Answer in units of "N north"

A long, straight wire carries a current. There is a uniform magnetic field directed downward (not due to the wire) and the force exerted on the wire is directed to the left. In what direction is the current?

Chapter 28, Problem 001 A proton traveling at 23.8° with respect to the direction of a magnetic field of strength 1.98 mT experiences a magnetic force of 9.59 × 10-¹7 N. Calculate (a) the proton's speed and (b) its kinetic energy in electron- volts. Chapter 28, Problem 009 In the figure, an electron accelerated from rest through potential difference V₁=1.06 kV enters the gap between two parallel plates having separation d = 24.5 mm and potential difference V₂= 99.1 V. The lower plate is at the lower potential. Neglect fringing and assume that the electron's velocity vector is perpendicular to the electric field vector between the plates. In unit-vector notation, what uniform magnetic field allows the electron to travel in a straight line in the gap? [₁}v₂

A proton that has a speed equal to 9.00105 m/s enters a region with a uniform magnetic field that has a magnitude of 0.730T and points into the page, as shown in the figure below. The proton enters the region at an angle θ= 60°. Find the exit angle φ and the distanced d.