Express the charge of 10 electrons in micro Coulomb? A metal hall has -2.0 Coulo

Question

Express the charge of 10 electrons in micro Coulomb? A metal hall has -2.0 Coulomb of charge. If it receives 0.5 times 10 number of electrons, what will be the resultant charge of the ball? A metal ball has +2.1 Coulomb of charge. If 1.0 times 10^19 number of electrons are removed from the ball, what will be the resultant charge of the ball? Two equal electric forces (25 Newton each) have an angle of 120 Degree. What is the value of resultant force? Two equal charges with magnitude Q experience a force F when placed at a distance of r. What is (he force between that same two charges when distance between those is r/3? What is the direction of a negative charge movement if it is placed in a uniform Electric field? The direction of net (or resultant) force on the charge located at point A due to other two charges is North-West, North-East, Youth-West Youth-East If the +q at point A is replaced with -q, then the direction of net (or resultant) force on the charge located at point A due to other two charges is North-West, North-East Youth-West, Youth-East Electric force between 2 equal positive charges is 1 N. If the separation between the charges is 1cm. what is the magnitude of each charge? In a uniform electric field of 2 N/C, what amount of electric charge can be hold with a 1.0 N force? 20 C, 0.5 C, 1 C, 2 C. 5 C

Explanation / Answer

Hi,

In this case I'm going to answer from the question 4 onwards, and due to the number of questions the answers will be short. However, as there are many questions, I will only answer nine of them. You can do the others yourself or you can post them as an independent question.

4. 0.5*1019 electrons = -0.801 C , therefore -2 C + (-0.801 C) = -2.801 C

Answer: b

5. 1*1019 electrons = -1.602 C, therefore +2.1 C - (-1.602 C) = +3.7 C

Answer: b

6. In this case I assume that said angle is measured between the force vectors. If that is the case, then:

F = 2*cos(60°) (25 N) = 25 N

Answer: e

7. If F = k Q/r2  ; then if r' = r/3 :::::::: F' = k Q/(r/3)2 = 9 (kQ/r2) ::::::: F' = 9F

Answer: c

8. The electric charge will move opposite to E field direction, as a positive charge does the contrary.

Answer: b

9. Both charges are pushing the charge at point A along the sides of the triangle, so the resultant force will point to the left inferior corner.

Answer: c

10. In this case, the opposite sign of the charge generates an equal force in magnitude, but opposite in sense. So the net force will point to the right superior corner.

Answer: b

11. F' = k (1 C2/1 m2) = 1 k N :::::::: F = (2F'2)1/2 = (2)1/2k N = 1.41 k N

Answer: c

12. Q2 = Fr2/k = (1N*1*10-4 m)/k ::::::: Q = 0.01/(k)1/2 C

Answer: d

I hope it helps.

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