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Test Index
Class 12 NEET Physics Electromagnetic Induction and Alternating Currents
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© examsnet.com
Question : 47
Total: 114
A series
R
−
C
circuit is connected to an alternating voltage source. Consider two situations :
(a) When capacitor is air filled.
(b) When capacitor is mica filled.
Current through resistor is
I
and voltage across capacitor is
V
then
[NEET 2015]
i
a
>
i
b
V
a
=
V
b
V
a
<
V
b
V
a
>
V
b
Validate
Solution:
👈: Video Solution
For series R-C circuit, capacitive reactance,
Z
=
√
R
2
+
(
1
C
ω
)
2
Current through resistor,
i
=
Current in the circuit
=
V
Z
c
=
V
√
R
2
+
(
1
C
ω
)
2
Voltage across capacitor,
V
=
i
X
C
=
V
√
R
2
+
(
1
C
ω
)
2
×
1
C
ω
=
V
√
R
2
ω
2
C
2
+
1
When mica is introduced capacitance will increase, hence voltage across capacitor gets decrease.
© examsnet.com
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