A fluorine ion contains 9 protons, 10 neutrons, and 10 electrons. What is the ne

Question

A fluorine ion contains 9 protons, 10 neutrons, and 10 electrons. What is the net charge of the ion? C The nucleus of a certain type of californium atom contains 98 protons and neutrons. What is the total charge of the nucleus? What is the electric force of attraction between charges of 3 C and -2 C separated by a distance of 6 m? N By what distance must two charges of +2 C and +2 C be separated so that the repulsive force between them is 3.40 times 10^10 N? A 5 mC charge experiences a force of 14 N directed east. What is the electric field (magnitude and direction) at the location of the charge? N/C N The electric potential energy of an object at point A is known to be 57 J. If it is released from rest at A, it gains 13 J of kinetic energy as It moves to point B. What is its potential energy at B? J Points A and B each have an electric potential of +10 V. How much work is required to take 5 mC of charge from A to B? J

Explanation / Answer

1 )

9 protons

10 neutrons

10 electrons

neutron having doesnot have charge it is neutral so it is 10 X 0 = 0

9 protons = 9 X e

and

10 electrons = - 10 X e

so total = 9 e - 10 e = - e

= - 1.6 X 10-19 C

2 )

98 X 1.6 X 10-19

= 1.56 X 10-17 C

3 )

F = k q1 q2 / r2

F = 9 X 109 X 3 X ( -2 ) / 62

F = - 1.5 X 109 N

4 )

F = k q1 q2 / r2

3.4 X 1010 = 9 X 109 X 2 X 2 / r2

r2 = 9 X 109 X 2 X 2 / 3.4 X 1010

r2 = 1.05882

r = 1.0289 m

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