A straight, stiff, horizontal wire of length 50 cm and mass 60 g is connected to a source of emf by light, flexible leads. A magnetic field of 1.33 T is horizontal and perpendicular to the wire. Find the current necessary to float the wire, that is, find the current for which the magnetic force balances the weight of the wire.
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- Two long, parallel wires separated by a distance d carry currents in opposite directions. If the left-hand wire carries a current i/2 and the right-hand wire carries a current i, determine where the magnetic field is zero.Two very long, parallel wires are separated by a distance of 2 m. The top wire carries a current of 16 A flowing to the left. Point x lies between the wires, 0.4 m below the top wire (see figure below). (a) What is the strength of the magnetic field at point x due to the top wire? For part (a) and (b) you may assume no current is flowing in the bottom wire. (b) What is the direction of the magnetic field at point x due current flowing in the top wire? (Give your answer in terms of toward the top, bottom, left side, right side, into, or out of the page.) (c) What current must flow through the bottom wire to have the net (total) magnetic field be zero at point x? Specify both the magnitude and the direction of the current.Two long, parallel, current-carrying wires lie in an xy-plane. The first wire lies on the line y = 0.400 m and carries a current of 25.0 A in the +x direction. The second wire lies along the x-axis. The wires exert attractive forces on each other, and the force per unit length on each wire is 290 μN/m. What is the y-value (in m) of the line in the xy-plane where the total magnetic field is zero? .207 Use the right-hand rule to determine the possible location of a point where the magnetic field is zero. Write an expression for the force of attraction between the wires, find expressions for the magnetic fields due to each wire at the point, and set them equal. Use your expression for the force per unit length to eliminate one of the currents, and solve for the required distance. m
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