What is the value of $1 D$ in $S I$ units ?

3.336 \times 10^{- 30} c m

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33.36 \times 10^{- 30} c m

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333.6 \times 10^{- 30} c m

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None of these

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Solution

The correct option is A $3.336 \times 10^{- 30} c m$
The debye is a CGS unit of electric dipole moment.
It is defined as $1 \times 10^{- 18}$ statcoulomb-centimetre and $3.33564 \times 10^{- 30} C . m$ .

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The equation for the vibration of a string, fixed at both ends vibrating in its third harmonic, is given

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iii. What is the length of the string?

iv. What is the wavelength and the speed of two travelling waves that can interfere to give this vibration?

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