Question

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Answer 1

Answer for 7th

for the first part

Ceq=ε0A/d

capacitance of capacitor C1

C 1 =k1ε0A/2d

capacitance of capacitor C2

C2=k2ε0A/2d

equivalent capacitance is given by

Ceq=C1 + C2

=k1ε0A/2d+k2ε0A/2d

=1/2(k1+k2)ε0A/d

=1/2(2+4)10=30micro Farad

Answer 2

a

d I the answer

I hope it help you