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`Fe ^+` ions are accelerated through a potential difference of 500 V and are injected normally into a homogeneous magnetic field B of strength 20.0 m T. Find the radius of the circular paths followed by the isotopes with mass numbers 57 and 58. Take the mass of an `ion = A (1.6 X10^(-27))` kg where A is the mass number.

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`1.1 xx 10^(6) V//m`
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