| Assertion (A): If an electron is not deflected when moving through a certain region of space, then the only possibility is that no magnetic field is present in that region. |
| Reason (R): Force on electron is directly proportional to the strength of the magnetic field. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
Option [a] is correct. Explanation: In absence of magnetic field, moving electron will not be deflected. This possibility is true. So, assertion is true. \[\overset{\to }{\mathop{F}}\,=q\overset{\to }{\mathop{(V}}\,\times \overset{\to }{\mathop{B)}}\,\]. So, force on electron is directly proportional to the strength of the magnetic field. So, reason is true. Reason properly explains the assertion.
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