Exam1 -Extra credit Calculate the electric field strength around a +20?C point d

Question

Exam1 -Extra credit Calculate the electric field strength around a +20?C point different distances: (a) 10.0cm, (b) 20.0cm, (c) 30.0cm 1. charge at the following 2. For the circuit drawn below find: a. the equivalent capacitance b. the voltage across each capacitor c. the charge on each capacitor A spherical conductor of radius 10 cm has a charge of 1.6x 10*C/m2 distributed uniformly throughout its volume. What is the strength and direction of the electric field at a point 20 cm from the center of the sphere? 3. -7 Qin pVsphere

Explanation / Answer

1.

Electricfield is given by:

E = kQ/R^2

1A.

when R = 10 cm = 0.1 m

Q = 20 uC = 20*10^-6 C

k = 9*10^9

E = 9*10^9*20*10^-6/0.1^2

E = 18*10^6 N/C

1B.

when R = 20 cm = 0.2 m

Q = 20 uC = 20*10^-6 C

k = 9*10^9

E = 9*10^9*20*10^-6/0.2^2

E = 4.5*10^6 N/C

1C.

when R = 30 cm = 0.3 m

Q = 20 uC = 20*10^-6 C

k = 9*10^9

E = 9*10^9*20*10^-6/0.3^2

E = 2*10^6 N/C

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