3rd Edition

ISBN: 9780321989246

Author: Knight

Publisher: PEARSON CO

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Textbook Question

Chapter 21, Problem 86MSPP

A Lightning Strike

Storm clouds build up large negative charges, as described in the chapter. The charges dwell in charge centers, regions of concentrated charge. Suppose a cloud has –25 C in a 1.0|dash|km|dash|diameter spherical charge center located 10 km above the ground, as sketched in Figure P21.86. The negative charge center attracts a similar amount of positive charge that is spread on the ground below the cloud.

Figure P21.86

Chapter 21, Problem 86MSPP, A Lightning Strike Storm clouds build up large negative charges, as described in the chapter. The

The charge center and the ground function as a charged capacitor, with a potential difference of approximately 4 × 10⁸ V. The large electric field between these two "electrodes" may ionize the air, leading to a conducting path between the cloud and the ground. Charges will flow along this conducting path, causing a discharge of the capacitor-a lightning strike.

What is the approximate magnitude of the electric field between the charge center and the ground?

A. 4 × 10⁴ V/m

B. 4 × 10⁵ V/m

C. 4 × 10⁶ V/m

D. 4 × 10⁷ V/m

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Chapter 21, Problem 85GP

Chapter 21, Problem 87MSPP

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Chapter 21 Solutions

EBK COLLEGE PHYSICS

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