5. The figure shows a parallel plate capacitor with a plate area A 5.56 cm and s

Question

5. The figure shows a parallel plate capacitor with a plate area A 5.56 cm and separation d 5.56 mm. (1 mm 10 m). The left half of the gap is filled with material of dielectric constant 7; the right half is filled with material of dielectric constant A2- 12. The capacitor is charged with a battery, subsequently the battery is disconnected. 5A Which of the following expressions is comect: a) The electric field at "P" is greater than the electric field at "S" b) The electric field at "P" is equal to the electric field at "S" The electric field at "S" is greater than the electric field at "P d) Since the electromotive force of the battery is unknown, there is not enough information to compare the values ofthe electric field at P and at "S" e) All the expressions above are incorrect. to (in units of 10 12 5A The capacitanc a 14 c 48 d) 1.7 e) NA

Explanation / Answer

5A) b is the correct answer.

Beacuse, the upper ends are at same potential

and lower ends are at same potential.

5B) 8.4

Here it acts two capacitors connected in parallel.

Cnet = C1 + C2

= k1*(A/2)*epsilon/d + k2*(A/2)*epsilon/d

= (A*epsilon/(2*d))*(k1+k2)

= (5.56*10^-4*8.854*10^-12/(2*5.56*10^-3))*(7+12)

= 8.41*10^-12 F

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