Question

A parallel plate capacitor with a mica dielectric (K = 5.5) completely filling the space between the plates, has a capacitance 12 nF and its plate separation is 2.5 mm. If a potential difference 25V is applied across the capacitors, amount of induced surface charge on mica and also electric field in mica will be nearly –

• A. 365.5 nc, 2639 N/C
• B. 245.5 nc, 1818 N/C
• C. 152.5 nc, 759 N/C
• D. 86.5 nc, 346 N/C

Answer 1

Answer: (B)

245.5 nc, 1818 N/C

Answer 2

Q_induced = $\mathrm { Q } \left( 1 - \frac { 1 } { \mathrm {~K} } \right)$ = CV