How many protons are needed to make up one Coulomb of electrical charge? A) 6.25

Question

How many protons are needed to make up one Coulomb of electrical charge? A) 6.25 times10^18 B) 1.69 times 10^19 C) 6.02 times 10^23 D 8.98 times 10^9 E) None of the above Four equal charges q_1 = q_2 = q_3 = q_4 = 1.0 times 10^-9 C are held in place at the corners of a square of side a = 3 mm. What is the strength of the electric field a the geometrical center of the square? A) 0.5 N/C B) 2 N/C D) 3.14 N/C E) None of the above 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 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 an 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 1mm 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

As you asked multiple questions, so l am bound to answer first three question.

(1)

charge of 1 proton = +1.6*10^(-19) C

we know that,

q = N*e

1 = N*1.6*10^(-19)

N = number of protons = 6.25*10^18

option A is correct.

(2)

Since, all four charges on corners of square are identicle.

so, due to the symmetry-

electric field at center = 0

option (C) is correct.

(3)

statement (C) is false.

Because An insulator does'nt have free electrons on its surface.

This is a characrestic of conductor.

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