Which statement is false A) A conductor allows free charges to move about within

Question

Which statement is false A) A conductor allows free charges to move about within it. B) Any excess of electrical charge will collect on the surface of a conductor. C) An insulator allows free charges to move about on its surface. D) A Faraday cage acts like a shield around the object, preventing electrical charge from penetrating inside. E) No statement is true Parallel plate capacitor is device made of two "large area" metal plates separated by insulating gap that is small compared to linear size of plates. If the plates have area of 1m^2 each and the gap between plates is 1 mm what is the electric potential roughly in the middle of the device? The charge on the positively charged plate of the capacitor is Q = 9 times 10^-10 C. A) 3.14 V B) 0.051 V C) 0.051 J/C D) -6.28 J/C E) None of the above What is the strength of the electrical field in the region where the electric potential is constant? A) Electric field is large B) Electric field is small C) Electric field changes rapidly D) Electric field is zero E) Not enough is known to make the conclusion

Explanation / Answer

Question 5 ) answer) option d) electric field is zero

Reason: electric field is given by the formula

E = - d(V)/dr

Here d(V) represents change in potential

Since it is given that electric potential is constant ,d(V) = 0

so d(V)/ dr = 0

E = d(V)/dr =0

therefore electric field is zero

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