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Two parallel plates of a capacitor, separated by 2 mm, are at a potential difference of 20V. A dielectric sheet of dielectric constant 2 and thickness 1 mm is inserted between the plates. How does the potential difference between the two plates change ?
  • a)
    If increases by 5 V
  • b)
    If decreases by 5 V
  • c)
    If increases by 10V
  • d)
    If decreases by 10V
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Two parallel plates of a capacitor, separated by 2 mm, are at a potent...
Initially the capacitance was given by 
Now after introduction of dielectric slab of thickness t and dielectric constant k the capacitances are both are connected series then as in series combination resultant capacitance will be c

Now charge will remain same.
Hence, initially potential  and after introduction of slab 
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Two parallel plates of a capacitor, separated by 2 mm, are at a potential difference of 20V. A dielectric sheet of dielectric constant 2 and thickness 1 mm is inserted between the plates. How does the potential difference between the two plates change ?a)If increases by 5 Vb)If decreases by 5 Vc)If increases by 10Vd)If decreases by 10VCorrect answer is option 'B'. Can you explain this answer?
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