1.

In the above question, if the direction of the field is reversed and is from B to A and g gt(Eq)/(m), then the period is :

Answer»

`2pi SQRT((l)/(G))`
`2pi sqrt((l)/(g+(EQ)/(m)))`
`2pi sqrt((l)/([g^(2)+((Eq^(2))/(m))]^(1//2)))`

Solution :Here g and `a_(e)` will be in opposite directions `:.` net acceleration `a.=g-a_(e)` as `g gt a_(e)`
`a.=g-(qE)/(m)`
`:.""T.=2pi sqrt((l)/(g-(qE)/(m)))`
Hence correct choiceis (B).


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