Assertion: A beam of electron can pass undeflected through a region of E and B.
Reason: Force on moving charged particle due to magnetic field may be zero in some cases.
Options:
(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 also false.