| 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): Electric force acting on a proton and an electron, moving in a uniform electric field is same, where as acceleration of electron is 1836 times that of a proton. |
| Reason (R): Electron is lighter than proton. |
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) As F = qE, and charge (q) on an electron and on a proton has the same magnitude, therefore force (F) on each is same. Now, acceleration a = F / m. Mass of electron \[=\frac{1}{1836}\]mass of a proton. Therefore, acceleration of electron is 1836 times that of a proton.
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