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Standard XII
Physics
AC Applied to a Resistor
In a purely r...
Question
In a purely resistive ac circuit, the current
A
Lags behind the e.m.f. in phase
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B
Is in phase with the e.m.f
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C
Leads the e.m.f. in phase
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D
Leads the e.m.f. in half the cycle and lags behind it in the other half.
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Solution
The correct option is
B
Is in phase with the e.m.f
In a purely resistive ac circuit, the current is in phase with the EMF.
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Match List I with list II
List-I
List- II
(a) Phase difference
between current
and voltage in a
purely resistive
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(i) π/2; current leads voltage
(b) Phase difference between
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(iii) π/2; current lags voltage
(d) Phase difference
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(iv)
tan
−
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(
X
C
−
X
L
R
)
Q.
Assertion :An inductance and a resistance are connected in series with an AC circuit. In this circuit, the current and the potential difference across the resistance lags behind potential difference across the inductance by an angle
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In a circuit, the current lags behind the voltage by a phase difference of
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