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TS EAMCET Medical 9 May 2019 Shift 1 Paper

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Question : 114 of 160
 
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A laser light beam of 1 MW was focussed to a spot size of an area 10−6m2. The rms electric field (in V/m) at the focal point is approximately.
Assume
1
4πε0
 = 9 × 109(
Nm2
c2
)
Validate
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