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| Figure 18.4 CONCEPTS AT A GLANCE External electrostatic forces that act on an object must be included in the net external force when using Newton’s second law to determine acceleration. In obtaining a DNA “fingerprint” (see photograph) using electrophoresis, an electrostatic force accelerates electrically charged DNA fragments to different terminal speeds in an agarose gel. (© Geoff Tompkinson/Photo Researchers) |
