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Nier-Johnson geometry involves a deflection of which of the following radians in a radial electrostatic field analyser?

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Nier-Johnson geometry involves a deflection of which of the following radians in a radial electrostatic field analyser?

(a) Π

(b) Π/2

(c) Π/3

(d) Π/4

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Right answer is (b) Π/2

Explanation: Nier-Johnson geometry involves a deflection of Π/2 radians in a radial electrostatic field analyser. A magnetic deflection of Π/3 radians follows the analyser.

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