6. At what distance from a point charge of 8.0 microCoulombs would the electrica

Question

6. At what distance from a point charge of 8.0 microCoulombs would the electrical potential be 4.2 X 104 V? 7. Parallel plates of area 100 sq. meters are 1 mm apart. The positive terminal of a 100 v battery is connected to the upper plate and the negative terminal to the lower one. What is the direction of the E field between the plates, and how much charge is on the upper plate? a) Down, 8.5 Coulombs. b) Down, 88.5 microCoulombs. e) Up, 5.88 nanoCoulombs d) None of these. 8. A solid spherical conductor of radius 1m is in electrostatic equilibrium. How much work is required to move a proton from the inside of the conductor to the surface?

Explanation / Answer

6) The electric potential (V) produced by an unit chrage at any point in space is given by

V = kQ//r

(where k = coloumb's contant = 8.98 x 109 Nm2/C2 , Q = charge = 8.0 micro coloumb's, r =distance = ? , V = 4.2 x 104 volts )

4.2 x 104 V = (8.98 x 109 Nm2/C2 * 8 x 10-6 C ) / r

r = 0.58 m

The distacne at which the point of 8.0 micro coloumbs would the electric potential be 4.2 x 104 V is 0.58 m

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