Explain why electric field lines must be at right angles
If you move along an equipotential line, no work is done since the potential difference is zero along the line. With this, explain why electric field lines must be at right angles to equipotential lines.
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Two large parallel metal plates are 2.2 cm apart and have charges of equal magnitude but opposite signs on their facing surfaces. Take the potential of the negative plate to be zero. If the potential halfway between the plates is then +5.5 V, what
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