A) E and B both are parallel to v
B) E is parallel to v but perpendicular to B
C) E is perpendicular to B
D) E, v and B are mutually perpendicular to each other and \[\upsilon =\frac{1}{\sqrt{\mu \varepsilon }}\]
Correct Answer: D
Solution :
When a proton enters into magnetic and electric field and moves without any deflection, then E, \[8.0A{{m}^{2}}\] and B are mutually perpendicular to each other. In this case, Electric force on proton = force due to magnetic field \[3\times {{10}^{-6}}C\] or \[6\times {{10}^{-3}}N\]
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