Multiple choice

What will be the new capacity of two plates if

(a) the distance between the plates is doubled (b) a slab of dielectric constant 8 is introduced between the two plates such that the entire space between the plates is filled by the slab where a parallel plate with air as a dielectric has a capacity of 20 μF.

  1. 10, 2.5 μF

  2. 10, 160 μF

  3. 40, 2.5 μF

  4. 40, 160 μF

  5. 40, 320 μF

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

C = 20 x 10-6 F; Ć = ?  C = A ε0K/d C ∝ 1/d ∴ C = C/2 = 10 μF C ∝ K Ć = K C = 20 x 8 = 160 μF