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Magnetics question

2020 · 7 Jan · Shift 2 · Q56
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Magnetics question

2020 · 7 Jan · Shift 2 · Q56

JEE MainPhysicsMagneticsMCQ+4 / −1
A particle of mass m and charge q has an initial velocity v→=v0j^\overrightarrow v = {v_0}\widehat jv=v0​j​. If an electric field E→=E0i^\overrightarrow E = {E_0}\widehat iE=E0​i and magnetic field B→=B0i^\overrightarrow B = {B_0}\widehat iB=B0​i act on the particle, its speed will double after a time:
  1. A
    3mv0qE0{{3m{v_0}} \over {q{E_0}}}qE0​3mv0​​
  2. B
    2mv0qE0{{\sqrt 2 m{v_0}} \over {q{E_0}}}qE0​2​mv0​​
  3. C
    3mv0qE0{{\sqrt 3 m{v_0}} \over {q{E_0}}}qE0​3​mv0​​
  4. D
    2mv0qE0{{2m{v_0}} \over {q{E_0}}}qE0​2mv0​​
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