Seven charged particles are fixed in place to form a square

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In the figure seven charged particles are fixed in place to form a square with an edge length of 4.0 cm. How much work must we do to bring a particle of charge +6e initially at rest from an infinite distance to the center of the square?
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and also this one: An LC circuit has an oscillation frequency of 7.0x104 Hz. If C = 5.4 μF, then L must be what?

Nicolebedine
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please do this for me: A 0.6-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.4×1012 V/m s. The magnetic field at a point 0.2 m from the axis has a magnitude of:?? ans=5.40e-5

Nicolebedine