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Chapter 21: Q4P (page 625)
In the return stroke of a typical lightning bolt, a current of exists for. How much charge is transferred in this event?
Answer:
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Question: In Fig. 21-32, particles 1 and 2 of charge are on ay-axis at distance d=17.0 cm from the origin. Particle 3 of charge is moved gradually along thex-axis from X=0to X=+5.0m. At what values ofxwill the magnitude of the electrostatic force on the third particle from the other two particles be (a) minimum and (b) maximum? What are the (c) minimum and (d) maximum magnitudes?
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In Fig. 21-44, what are the (a) magnitude and (b) direction of the net electrostatic force on particle 4 due to the other three particles? All four particles are fixed in the plane, and,,,,,,,and .
Identical isolated conducting spheres 1 and 2 have equal charges and are separated by a distance that is large compared with their diameters (Fig. 21-22a). The electrostatic force acting on sphere 2 due to sphere 1 is.Suppose now that a third identical sphere 3, having an insulating handle and initially neutral, is touched first to sphere 1 (Fig. 21-22b), then to sphere 2 (Fig. 21-22c), and finally removed (Fig. 21-22d). The electrostatic force that now acts on sphere 2 has magnitude. What is the ratio?
Figure 21-17 shows four arrangements of charged particles. Rank the arrangements according to the magnitude of the net electrostatic force on the particle with charge, greatest first.
In crystals of the salt cesium chloride, cesium ions form the eight corners of a cube and a chlorine ion is at the cube鈥檚 center (Fig. 21-36). The edge length of the cube is . The ions are each deficient by one electron (and thus each has a charge of role="math" localid="1661790179659" ), and the ion has one excess electron (and thus has a charge of ). (a)What is the magnitude of the net electrostatic force exerted on the ion by the eight ions at the corners of the cube? (b) If one of theions is missing, the crystal is said to have a defect; what is the magnitude of the net electrostatic force exerted on theion by the seven remainingions?
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