P A straight infinite current-carrying wire is bent into the form shown in the figure above. I = 12 A. The curve is a semicircle of radius a = 75 cm. What is the field at the point P? T out of the page.
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- Consider two very long cylindrical wires (see image) of radius R, with current moving in the same direction. The centers of the wires are a distance 4R apart. Both wires have a uniform current density Jo. In the image, the line connecting the centers of the wires is an imaginary line to help visualize distances. a. What is the magnetic field at point (a), midway between the wires? b. What is the magnetic field at point (b) which is a point R/3 from the center of the left wire along the line connecting the two wire centers? c. What is the magnetic field at point (c), the center of the left wire? Side view current flows right Cross - Section View current into page -42A finite current-carrying wire lies on the y-axis as shown below. The current has a constant magnitude of I. The wire goes from y =d to y = c . Point P lies on the x-axis at æ = -b.Po Dalcho 2. A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire?
- A square loop of current is in a magnetic field. a. If the field is uniform, is there always a net force, never a net force, or sometimes a net force? Explain or prove your answer mathematically. If you said sometimes, explain under what circumstances you get a net force and under what circumstances you do not get a net force. b. If the field is NOT uniform, is there always a net force, never a net force, or sometimes a net force? Explain or prove your answer mathematically. If you said sometimes, explain under what circumstances you get a net force and under what circumstances you do not get a net force.A wire has a current of 30 A going down the page. What is the B field and its direction 0.2 m to the right of the wire? What is the force and direction on an electron traveling 400 m/s up at this point?A solid cylinder has a uniform magnetization M throughout the volume in the z direction Where are the bound currents? Select one: O a side rounded surface only O b. every where in the volume and surface O C. top, bottom surface only O d. Volume only not surface O e. All surfaces but not volume
- Two parallel wires, separated by a perpendicular distance of 5.0 cm, carry currents of 5.0 A and 2.0 A in the same direction. What force does the 5.0-A wire exert on a 50 cm-length of the 2.0-A wire? a. 60 μN, repulsive b. 40 μN, attractive c. 20 μN, attractive d. 80 μN, attractive e. 100 μN, attractiveConsider a long, horizontal Large Wire with current of 10 A running through it. We want to levitate a horizontal, thin, 0.50 m length of wire above it. If the thin wire has a mass of 10 grams, and a current of 300 mA, how far above the Large Wire will it hover (net force of zero) due to magnetic and gravitational forces? A. If the thin wire hovers above the Large Wire due to their magnetic fields, are their currents going the same direction, or opposite directions. Explain. B. Draw a diagram and label the directions of currents, and all other relevant quantities and vectors. C. Find the distance above the Large Wire the small thin wire will hover (net force of zero). D. Would your answers to parts A and C change if we wanted to find a distance below (rather than above) the Large Wire that the smaller thin wire could hover, due to their magnetic fields. Explain. Don't calculate any values but draw a new diagram and explain how this situation compares to the problem above.A cube has two rings on opposite faces of the cube. The rings carry equal currents i. The rings are sized such that their diameters are equal the side length of the cube s. What is the field strength in the center of the cube if the currents run such that the field strength is as big as possible? Start with a derivation of B from a ring. Please include a diagram for the problem.