The relative permittivity of water is 81. If ε0 and ε are permittivities of vaccum and water respectively Then:
ε0=9εw
ε0=81εw
εw=9ε0
εw=81ε0
A
ε0=81εw
B
εw=9ε0
C
ε0=9εw
D
εw=81ε0
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Solution
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The correct option is Dεw=81ε0 The relative permittivity of water id defined as:
εrel=εwε0
Substituting the values:
81=εwε0
So, εw=81ε0
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