NEET 2015 Physics and Chemistry Paper

For series R-C circuit, capacitive reactance,
Z=√R2+(‌

1

Cω

)2
Current through resistor, i= Current in the circuit
=‌

V

Zc

=‌

V

√R2+(‌ 1 Cω )2

Voltage across capacitor, V=iXC
=‌

V

√R2+(‌ 1 Cω )2

×‌

1

Cω

=‌

V

√R2ω2C2+1

When mica is introduced capacitance will increase, hence voltage across capacitor gets decrease.