| Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason: |
| (R). Mark the correct choice as: |
| Assertion (A): The charge on a body can be increased or decreased in terms of electronic charge e. |
| Reason (R): Quantisation of charge means that the charge on a body is the integral multiple of electronic charge e. |
A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
C) Assertion (A) is true but Reason (R) is false
D) Assertion (A) is false and Reason (R) is also false
Correct Answer: A
Solution :
(a) All the observable charges have to be integral multiple of e. Thus if a body contains \[{{n}_{1}}\] electrons and \[{{n}_{2}}\] protons, the total amount of charge on the body is \[{{n}_{2}}e+{{n}_{1}}\left( -e \right)=\left( {{n}_{2}}-{{n}_{1}} \right)e\]. Since, \[{{n}_{1}}\]and \[{{n}_{2}}\] are integers, their difference is also an integer. Thus the charge on any body is always an integral multiple of e and can be increased or decreased in terms of e.
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