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Introductory Physics Homework Help
Find the charge of a mass hanging from a pendulum in an electric field
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[QUOTE="spsch, post: 6196962, member: 650597"] [B]Homework Statement:[/B] A charge with mass 1 gram hanging from a pendulum is at equilibrium 12 cm above the lowest vertical position. E= 9500. l the length of the pendulum is 55 cm. [B]Relevant Equations:[/B] QEd = mgh? Hi, so I was able to solve this problem by just equating the forces (Tension, mg, and EQ). But I thought I could also solve this problem with Conservation of Energy. However, I calculated it several times, and I never get the right answer this way. Doesn't the Electric Field do the work to put this charge at its new Gravitational Potential Energy position 12cm higher? Or the -difference in Electric Potential is the Gravitational Potential gained? ## Q*E*d = m*g*x ## and therefore ## \frac {mgx}{Ed} = Q ## ? Or is there another Energy term I am missing? [/QUOTE]
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Introductory Physics Homework Help
Find the charge of a mass hanging from a pendulum in an electric field
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