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I2 Four long, parallel wires are located at the corners of a square of side a = 20 cm, as shown in the figure above, where I = 8 A, I2 = 3 A, I3 = 8 A, I4 = 1 A. Find: a) the resultant magnetic field at the center of the square: Î+ j+ k) T. b) the force on an electron moving at 5 x 10° i m/s as it passes the center: it j+ k) N

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.

A metal ring carries a current that causes a magnetic field B0 at the center of the ring and a field B at point P a distance x from the center along the axis of the ring. If the radius of the ring is doubled, find the magnetic field at the center. Will the field at point P change by the same factor? Why?

A wire carrying 5 A of current is oriented at 27° with respect to the magnetic field whose magnitude is 20 mT. What is the force per meter on this wire?

Parallel wires that are a distance, d = 20 cm, apart carry different amounts of current in opposite directions as shown in the figure.Top wire carries current, I1 = 50 A, to the right while that in the bottom one, I2 = 10 A, flows left. Determine the magnitude and direction of the net magnetic field at a point midway between the two wires.

A horizontal current-carrying wire that is perpendicular to the plane of the paper is placed in a uniform magnetic field of magnitude 2.2 mT that is parallel to the plane of the paper and points down. At the distance 1.0 cm to the right of the wire, the total magnetic field is zero.

magnetic fields Problem 19:   Consider the two wires in the figure, running at a right angle to each other. The wires carry the same current I = 6.5 mA, in the directions shown. The distances shown are d1 = 31 cm and d2 = 11.5 cm.   Part (a)  What is the magnitude of the magnetic field, in tesla, at point A?  Part (b)  What is the magnitude of the magnetic field, in tesla, at point B?  Part (c)  What is the magnitude of the magnetic field, in tesla, at point C?

Three long, parallel conductors each carry a current of I = 2.00 A. Figure is an end view of the conductors, with each current coming out of the page. Taking a = 1.00 cm, determine the magnitude and direction of the magnetic field at point A. (Hint: The magnetic field of a long, straight, current-carrying conductor at all points on a circle of radius r around the conductor is B = where Ho = 4n x 10-7 T.m/A). 2ar I