An electron moves through a uniform magnetic fields given by `vecB=B_(x)hati+(3.0B_(x))hatj`. At aparticular instant, the electr

An electron moves through a uniform magnetic fields given by `vecB=B_(x)hati+(3.0B_(x))hatj`. At aparticular instant, the electron has velocity `vecv=(2.0hati++4.0hatj)m//s` and the magnetic force acting on it is `(6.4xx10^(-19)N)hatk`. The value of `B_(x)` (in T) will
A. `-3.0`
B. 3
C. 2
D. `-2.0`

An electron moves through a uniform magnetic fields given by `vecB=B_(x)hati+(3.0B_(x))hatj`. At aparticular instant, the electron has velocity `vecv=

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