20_InstSolManual_PDF_Part26 - 20-26 Chapter 20 m0 I S The...

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20.89. Set Up: The direction of is given by the right-hand rule. Solve: (a) The currents are the same so points where the two fields are equal in magnitude are equidistant from the two wires. The net field is zero along the dashed line shown in Figure 20.89a. Figure 20.89 (b) For the magnitudes of the two fields to be the same at a point, the point must be 3 times closer to the wire with the smaller current. The net field is zero along the dashed line shown in Figure 20.89b. (c) As in (a), the points are equidistant from both wires. The net field is zero along the dashed line shown in Fig- ure 20.89c. Reflect: The lines of zero net field consist of points at which the fields of the two wires have opposite directions and equal magnitudes. 20.90. Set Up: Since the magnetic force is always perpendicular to the velocity of the object, a charged particle moving perpendicular to the field travels in an arc of a circle with radius Solve: (a) The direction of curvature of the path tells us the direction of the force on the particle. If this is the same
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