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A charged particle having a charge of 2x10^-9 and mass 8.3x10^-17 goes undeflected when passing through...

A charged particle having a charge of 2x10^-9 and mass 8.3x10^-17 goes undeflected when passing through perpendicular electric field E (7.5x10^3 V/m) and magnetic field B (0.25 T).

1) What is the speed of the charged particle?

2) When the electric field is turned off, the charged particle moves in a circle. What is the radius of the circle?

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