The potential difference between two parallel plates of a condenser which are 4 mm apart is 800 V. (a) What is the potential gradient? (b) What is the force on a proton which is midway between the plates?
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Given:
"d=\\rm 4 \\: mm=0.004\\: m"
"V=800\\:\\rm V"
(a) the potential gradient
"E=\\frac{V}{d}=\\rm \\frac{800\\: V}{0.004\\: m}=2*10^5\\: V\/m"(b) the force on a proton which is midway between the plates
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