If the distance of screen from a CRT to centre of deflection plates is 20 cm. The length of deflection plate is 2 cm. The distance between the plates is 1 cm and the accelerating voltage is 500 V, the deflection sensitivity is ______ cm/V.

0.4

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0.04

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Solution

The correct option is C 0.04
In case of CRO deflection sensitivity
$S = \frac{L l_{d}}{2 d V_{a}}$

$L = 20 c m$

$l_{d} = 2 c m$

$d = 1 c m$

$V_{a} = 500 V$

$S = \frac{20 \times 2}{2 \times 1 \times 500} = 0.04 c m / V$

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If the distance of screen from a CRT to centre of deflection plates is 20 cm. The length of deflection plate is 2 cm. The distance between the plates is 1 cm and the accelerating voltage is 500 V, the deflection sensitivity is ______ cm/V.

The correct option is C 0.04In case of CRO deflection sensitivity S=Lld2dVa L=20cm ld=2cm d=1cm Va=500V S=20×22×1×500=0.04cm/V

The correct option is C 0.04
In case of CRO deflection sensitivity
$S = \frac{L l_{d}}{2 d V_{a}}$

$L = 20 c m$

$l_{d} = 2 c m$

$d = 1 c m$

$V_{a} = 500 V$

$S = \frac{20 \times 2}{2 \times 1 \times 500} = 0.04 c m / V$