A 18.9 g wire of length 88.6 cm is suspended by a pair of flexible leads in a uniform magnetic field of magnitude 0.484 T (see the figure). What is the (a) magnitude and (b) direction (left or right) of the current required to remove the tension in the supporting leads?

A straight 7.757 m wire carries a current of 0.895 A. If the wire is passed through a region of space with a uniform magnetic field of 0.665 T that is perpendicular to the flow of current, what is the magnitude of the force on the wire?

A 17.0 g wire of length 52.0 cm is suspended by a pair of flexible leads in a uniform magnetic field of magnitude 0.585 T (see the figure). What is the (a) magnitude and (b) direction (left or right) of the current required to remove the tension in the supporting leads? X

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"

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 charge of 4.17 x 10^6 C moves to the right as shown through a region containing both a magnetic field of strength 2.12 T directed into the screen and an electric field of strength 1.78 x 10^5 N/C directed downward. The charge continues through the region at a constant velocity (no acceleration). What is the charge s speed?  8.40E+03 m/s  8.40E+04 m/s  6.72E+04 m/s  5.04E+04 m/s