You have 4 equal point charges, say 5.00 mu C, at the 4 corners of a square: (x,

Question

You have 4 equal point charges, say 5.00 mu C, at the 4 corners of a square: (x,y) = (1 cm, 1cm), (1cm, -1 cm), (-1cm, 1cm) and (-1 cm, -1 cm) What Is the electric field at the center of this array of charges Magnitude = Units = Is E(0,20 cm) a vector, a scalar (circle) You place a point charges, of +5.00 mu C at y = 20.0 cm and a point charge of -5.00 mu C at y = -20.0 cm. What is the electrical potential at x=0. y=0? How much work was done to bring the charges to their current locations, beginning at Infinite separation? Is the work + or = Consider a capacitor composed of 1 cm^2 plates separated by a layer of mica 0.02 cm thick. You connect the capacitors to a 90 V battery. What would the electric field In the region of space between the plates be if the plates were separated by vacuum? Suppose the dielectric constant for mica to be 6 What then is the electric field then between the plates? What is the capacitance of this mica filled capacitor? Now consider the global capacitance, a sphere of 4000 km radius, at a distance 50 km from ground potential. If the electric field in the atmosphere is 100 Volts/m. pointing downward, and E * 4 pi R^2 = Q/epsilon_0, what is Q/4 pi R^2 in C/m^2? In electrons/m^2? We now consider how some of the macroscopic quantities relate to atomic quantities. Charge is specified as coulombs (C), currents are specified in Amperes (A), Potential differences are specified in Volts. 1 volt =1J/C. 1W 1J/s 1C = 1F/V Remember that each electron carries a charge of -1.6 Times 10^-19 coulomb. Almost all the important relationships involve just 3 symbols

Explanation / Answer

1) Electric field at center = 0

because of symmetry, electric field due to charges at opposite corner will cancel each other.

Magnitude: 0

units: N/C

E(0,2cm) is a vector

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