If an atom loses an electron, it is (a) negatively charged (b) positively charge

Question

If an atom loses an electron, it is (a) negatively charged (b) positively charged (c) neutral (d) Not enough information How many electrons would it require to generate a 5 N attractive force on a +3 mu C charge from 5 0.1 m away (a) 2.13 times 10^-13 electrons (b) 1.15 times 10^13 electrons (c) 3.15 times 10^14 electrons (d) 4.15 times 10^15 electrons what is the electric field at a distance of 10 cm from an isolated point particle with a charge of 2 nC? Coulomb's constant, k = 8.99 times 10^9 Nm^2/C^2. (a) 0.0018 N/C (b) 180 N/C (c) 1800 N/C (d) 18000 N/C An electron volt is (a) the force acting on an electron in a field of 1 N/C (b) the force required to move an electron 1 meter (c) the energy needed to move an electron through 1 meter in any electric field (d) the energy gained by an electron in moving through a potential difference of 1 volt A 120-V power line is protected by a 12-A fuse. What is the maximum number of "120 V, 500 W" light bulbs that can be operated at full brightness from this line? (a) 1 (b) 2 (c) 3 (d) 4

Explanation / Answer

5. (B) positively charged/

6. F = k q1 q2 / r^2

5 = (9 x 10^9) (3 x 10^-6) (q) / 0.1^2

q = 1.85 x 10^-6 C

n = (1.85 x 10^-6 ) / (1.6 x 10^-19)

n = 1.16 x 10^13

Ans(b)

7. E = kq / r^2

= (9 x 10^9) (2 x 10^-9) / 0.10^2

= 1800 N/C

Ans(C)

8. (d)

9. P = V^2 / R

R = 120^2 / 500 = 28.8 ohm

Req = V / I = 120 / 12 = 10 A

Ans(b)

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