An ion with charge of 3.2 10^-19~ C and mass of 6.64 10^-27~ kg is moving w…

Magnetic Force

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 An ion with charge of 3.2×10−19 C3.2\times 10^{-19}~\rm C3.2×10−19 C  and mass of  6.64×10−27 kg6.64\times 10^{-27}~\rm kg6.64×10−27 kg  is moving with velocity of 8×104 m/s ȷ^8\times 10^4~\rm m/s~\hat\jmath8×104 m/s ^​  in a region where there is a uniform magnetic field with intensity of −1 T ȷ^-1~\rm T~\hat\jmath−1 T ^​ 
What is the radius of rotation of the ion?
What is the vector that connects the ion to the center of the circle?
If the particle is set to equilibrium with applying an electric field, what E field is required?

R = 23.6⋅10−9 m , r = −2.6⋅104, E = 5.5 ⋅104R\ =\ 23.6\cdot10^{-9}\ m\ ,\ r\ =\ -2.6\cdot10^4,\ E\ =\ 5.5\ \cdot10^4R = 23.6⋅10−9 m , r = −2.6⋅104, E = 5.5 ⋅104

R = 16.6⋅10−9 m , r = −16.6⋅104, E = 8 ⋅104R\ =\ 16.6\cdot10^{-9}\ m\ ,\ r\ =\ -16.6\cdot10^4,\ E\ =\ 8\ \cdot10^4R = 16.6⋅10−9 m , r = −16.6⋅104, E = 8 ⋅104

R = 33.6⋅10−9 m , r = −5.6⋅104, E = 14 ⋅104R\ =\ 33.6\cdot10^{-9}\ m\ ,\ r\ =\ -5.6\cdot10^4,\ E\ =\ 14\ \cdot10^4R = 33.6⋅10−9 m , r = −5.6⋅104, E = 14 ⋅104

R = 24.6⋅10−9 m , r = −5.6⋅104, E = 7 ⋅104R\ =\ 24.6\cdot10^{-9}\ m\ ,\ r\ =\ -5.6\cdot10^4,\ E\ =\ 7\ \cdot10^4R = 24.6⋅10−9 m , r = −5.6⋅104, E = 7 ⋅104

I don't know

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An ion with charge of 3.2 10^-19~ C and mass of 6.64 10^-27~ kg is moving w…

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