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Q.

If the electric field between the plates of a cathode ray oscilloscope be 1.2×104 N /C , the deflection that an electron will experience if it enters at right angles to the field with kinetic energy 2000 eV is (The deflection assembly is 1.5cm long.)

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a

0.34 cm

b

3.4 cm

c

0.034 mm

d

0.34 mm

answer is D.

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Detailed Solution

Deflection y=eEx24(K) where K is kinetic energy.

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If the electric field between the plates of a cathode ray oscilloscope be 1.2×104 N /C , the deflection that an electron will experience if it enters at right angles to the field with kinetic energy 2000 eV is (The deflection assembly is 1.5cm long.)