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Electric Charges and Fields — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectric Charges and Fields1 Mark
MCQ
The electrostatic force between two point charges $q _1$ and $q _2$ at separation ' r ' is given by $F =\frac{ K _{ q q^2}}{ r ^2}$. The constant $K$ :
  • A
    Depends on the system of units only.
  • B
    Depends on the medium between the charges only.
  • ✓
    Depends on both the system of units and the medium between the charges.
  • D
    Is independent of both the system of units and the medium between the charges.
✓

Answer

Correct option: C.
Depends on both the system of units and the medium between the charges.
c. Depends on both the system of units and the medium between the charges.
Explanation:
$K =\frac{1}{4 \pi \epsilon_{ o } k }$ and its units is $N - m ^2 / C ^2$
It depend on system of unit and dielectric constant (k), that's medium between charges

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