A parallel plate capacitor of capacitance 7.8 micro F has the space between the

Question

A parallel plate capacitor of capacitance 7.8 micro F has the space between the plates filled with a slab of glass with ? = 3.7. The capacitor is charged by attaching it to a 1.0-V battery. After the capacitor is disconnected from the battery, the dielectric slab is removed. (a) Find the capacitance after the glass is removed. _F (b) Find the potential difference after the glass is removed. _V (e) Find the charge on the plates after the glass is removed. _C (d) Find the energy stored in the capacitor after the glass is removed. _J

Explanation / Answer

apply for capacitors

a. C = KeoA/d = Q/V

C =7.8 e-6/(1)

C = 7.8 uF

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b. V =   V0 = 3.7

V =    3.7 V

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c. Q = CV = 7.8* 3.7 = 28.86 uC

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d. eenrgy U = 0.5 QV

U = 0.5 * 28.86 *.3.7

U = 53.39 uJ

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