How many protons are needed for 1 C of charge? (a) 1.6 times 10^-19 (b) 1 (c) 6.

Question

How many protons are needed for 1 C of charge? (a) 1.6 times 10^-19 (b) 1 (c) 6.2 times 10^18 (d) 6.0 times 10^25 A magnitude of electric field from a point-like charge falls down with distance as (a) 1/r (b) 1/r^2 (c) 1/r^3 (d) wait... this is not general chemistry exam??? An electric dipole consists of (a) Two charges of equal magnitude but opposite signs separated by a small distance (b) Two charges of equal magnitude and equal signs separated by a small distance (c) Any number of charges of equal magnitude (d) Any number of charges with any magnitude A force between two point charges is measured to be 5 N. What happens to the force if you bring the charges twice as close to each other? (a) it will double (b) it will quadruple (c) it will decrease by a factor of two (d) it will decrease by a factor of four (e) it will stay the same If 10 J of work is required to carry a 1 C charge from one point to another, the electric potential difference between these two points is (a) 0.01 V (b) 10,000 V (c) 0.1 V (d) 10 V (e) depends on the path (f) none of these

Explanation / Answer

2. Q = n e

n = (1 C) / (1.6 x 10^-19 )

n = 6.25 x 10^18 protons

3. E = k q / r^2

E is propotional to the 1/r^2 .

Ans(b)

4. (a)

5. F= k q1 q2 / r^2

r -> r/2

F -> 4 F

Ans(b)

6. W = q deltaV

deltaV = 10 Volt

Ans(d)

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