- Introduction
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- Alternating current and Alternating EMF
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- Average or mean current
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- Root Mean square value of AC
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- Phasor diagram
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- A.C through pure resistor
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- A.C through pure inductor
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- AC through pure capacitor
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- Circuit containing inductance and resistance in series
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- Circuit containing capacitance and resistance in series
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- LCR series circuit

a) 10 ohm

b) 100 ohm

c) 30 ohm

d) 40 ohm

a) 1 A

b) 3 A

c) 2 A

d) 5 A

a) 97 ohm

b) 50 ohm

c) 90 ohm

d) None of these

A) V

B) V

C) V

D) V

P) 88 V

Q) 194 V

R) 200 V

S) 60 V

T) No appropriate match

A) Power dissipated in coil

B) Power dissipated in Resistor

C) Power loss of the circuit

P) 144 W

Q) 320 W

R) 176 W

S) No appropriate match

Solutions for Question 1-6

An Alternating voltage (in volts) varies with time (in sec) as

$V=100 \sqrt {2} sin (100 \pi t)$

Match with column with above context in mind

A) Peak value of Voltage

B)Rms value of the voltage

C) Frequency of the voltage

D)Mean square value of the voltage

P) 100

Q) $10 \sqrt 2$

R) 50

S) 10

Solution

a) How long will it take for the current to reach the half the maximum value

b) Find the time constant

c) Find out the value of dI/dt at t =0

Solution

An LCR circuit in series has following values

R=11 Ohm

X

X

The circuit is connected with 110 V ,60 Hz power source

A) V

B) V

C) V

D) $\sqrt { V_R^2 +(V_L -V_C)^2$

P) 1200V

Q) 110

R) 1100V

T) Data not sufficient

Solution

An circuit consists of a series combination of a 50mH inductor and a 20μF capacitor. The circuit is connected to AC supply of 220V and 50 Hz .

The circuit has the value of R=0

a) I

b) I

c) V

\) None of these

a) Voltage drop across inductor is 23.1 V

b) Voltage drop across capacitor is 243 V

c) Voltage drop across inductor is 243 V

d) Voltage drop across capacitor is 23.1 V

a) Average power transferred to inductor is zero

b) Average power transferred to capacitor is zero

c) Average power absorbed by the circuit is zero

d) None of the above

Solutions for Question 10-12

Class 12 Maths Class 12 Physics

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