Electromagnetic Induction and Alternating Currents: JEE Mains Previous Year Questions (2021-2024) | Physics for JEE Main & Advanced PDF Download

 Page 1


Q1 - 2024 (01 Feb Shift 1) 
A parallel plate capacitor has a capacitance C = 200pF. It is connected to 230V ac 
supply with an angular frequency 300rad/s. The rms value of conduction current in the 
circuit and displacement current in the capacitor respectively are : 
(1) 1.38?? A a nd 1 .38?? A 
(2) 14.3?? A a nd 1 43?? A 
(3) 13.8?? A n a d 1 38?? A 
(4) 13.8?? A a nd 1 3.8?? A 
Q2 - 2024 (01 Feb Shift 1) 
In series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance 
frequency unchanged, the new inductance should be : 
(1) reduced by 
1
4
L 
(2) increased by 2L 
(3) reduced by 
3
4
L 
(4) increased to 4L 
Q3 - 2024 (01 Feb Shift 2) 
A transformer has an efficiency of 80% and works at 10V and 4kW. If the secondary 
voltage is 240V, then the current in the secondary coil is : 
(1) 1.59A 
(2) 13.33A 
(3) 1.33A 
(4) 15.1A 
Q4 - 2024 (27 Jan Shift 2) 
Primary side of a transformer is connected to 230V, 50Hz supply. Turns ratio of primary 
to secondary winding is 10: 1. Load resistance connected to secondary side is 46O. The 
power consumed in it is : 
(1) 12.5W 
(2) 10.0W 
(3) 11.5W 
(4) 12.0W 
Q5 - 2024 (27 Jan Shift 2) 
A series LCR circuit with L =
100
?? mH, C =
10
-3
?? Fand R = 10O, is connected across an ac 
source of 220V, 50Hz supply. The power factor of the circuit would be 
Q6 - 2024 (29 Jan Shift 2) 
Page 2


Q1 - 2024 (01 Feb Shift 1) 
A parallel plate capacitor has a capacitance C = 200pF. It is connected to 230V ac 
supply with an angular frequency 300rad/s. The rms value of conduction current in the 
circuit and displacement current in the capacitor respectively are : 
(1) 1.38?? A a nd 1 .38?? A 
(2) 14.3?? A a nd 1 43?? A 
(3) 13.8?? A n a d 1 38?? A 
(4) 13.8?? A a nd 1 3.8?? A 
Q2 - 2024 (01 Feb Shift 1) 
In series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance 
frequency unchanged, the new inductance should be : 
(1) reduced by 
1
4
L 
(2) increased by 2L 
(3) reduced by 
3
4
L 
(4) increased to 4L 
Q3 - 2024 (01 Feb Shift 2) 
A transformer has an efficiency of 80% and works at 10V and 4kW. If the secondary 
voltage is 240V, then the current in the secondary coil is : 
(1) 1.59A 
(2) 13.33A 
(3) 1.33A 
(4) 15.1A 
Q4 - 2024 (27 Jan Shift 2) 
Primary side of a transformer is connected to 230V, 50Hz supply. Turns ratio of primary 
to secondary winding is 10: 1. Load resistance connected to secondary side is 46O. The 
power consumed in it is : 
(1) 12.5W 
(2) 10.0W 
(3) 11.5W 
(4) 12.0W 
Q5 - 2024 (27 Jan Shift 2) 
A series LCR circuit with L =
100
?? mH, C =
10
-3
?? Fand R = 10O, is connected across an ac 
source of 220V, 50Hz supply. The power factor of the circuit would be 
Q6 - 2024 (29 Jan Shift 2) 
In an a.c. circuit, voltage and current are given by :V = 100sin(100t)V and ?? =
100sin 100?? +
?? 3
 mA respectively. 
The average power dissipated in one cycle is : 
(1) 5W 
(2) 10W 
(3) 2.5W 
(4) 25W 
Q7 - 2024 (29 Jan Shift 2) 
In the given figure, the charge stored in 6?? F capacitor, when points A and B are joined by 
a connecting wire is ?? C. 
Page 3


Q1 - 2024 (01 Feb Shift 1) 
A parallel plate capacitor has a capacitance C = 200pF. It is connected to 230V ac 
supply with an angular frequency 300rad/s. The rms value of conduction current in the 
circuit and displacement current in the capacitor respectively are : 
(1) 1.38?? A a nd 1 .38?? A 
(2) 14.3?? A a nd 1 43?? A 
(3) 13.8?? A n a d 1 38?? A 
(4) 13.8?? A a nd 1 3.8?? A 
Q2 - 2024 (01 Feb Shift 1) 
In series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance 
frequency unchanged, the new inductance should be : 
(1) reduced by 
1
4
L 
(2) increased by 2L 
(3) reduced by 
3
4
L 
(4) increased to 4L 
Q3 - 2024 (01 Feb Shift 2) 
A transformer has an efficiency of 80% and works at 10V and 4kW. If the secondary 
voltage is 240V, then the current in the secondary coil is : 
(1) 1.59A 
(2) 13.33A 
(3) 1.33A 
(4) 15.1A 
Q4 - 2024 (27 Jan Shift 2) 
Primary side of a transformer is connected to 230V, 50Hz supply. Turns ratio of primary 
to secondary winding is 10: 1. Load resistance connected to secondary side is 46O. The 
power consumed in it is : 
(1) 12.5W 
(2) 10.0W 
(3) 11.5W 
(4) 12.0W 
Q5 - 2024 (27 Jan Shift 2) 
A series LCR circuit with L =
100
?? mH, C =
10
-3
?? Fand R = 10O, is connected across an ac 
source of 220V, 50Hz supply. The power factor of the circuit would be 
Q6 - 2024 (29 Jan Shift 2) 
In an a.c. circuit, voltage and current are given by :V = 100sin(100t)V and ?? =
100sin 100?? +
?? 3
 mA respectively. 
The average power dissipated in one cycle is : 
(1) 5W 
(2) 10W 
(3) 2.5W 
(4) 25W 
Q7 - 2024 (29 Jan Shift 2) 
In the given figure, the charge stored in 6?? F capacitor, when points A and B are joined by 
a connecting wire is ?? C. 
 
Q8 - 2024 (30 Jan Shift 1) 
Primary coil of a transformer is connected to 220V ac. Primary and secondary turns of 
the transforms are 100 and 10 respectively. Secondary coil of transformer is connected 
Page 4


Q1 - 2024 (01 Feb Shift 1) 
A parallel plate capacitor has a capacitance C = 200pF. It is connected to 230V ac 
supply with an angular frequency 300rad/s. The rms value of conduction current in the 
circuit and displacement current in the capacitor respectively are : 
(1) 1.38?? A a nd 1 .38?? A 
(2) 14.3?? A a nd 1 43?? A 
(3) 13.8?? A n a d 1 38?? A 
(4) 13.8?? A a nd 1 3.8?? A 
Q2 - 2024 (01 Feb Shift 1) 
In series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance 
frequency unchanged, the new inductance should be : 
(1) reduced by 
1
4
L 
(2) increased by 2L 
(3) reduced by 
3
4
L 
(4) increased to 4L 
Q3 - 2024 (01 Feb Shift 2) 
A transformer has an efficiency of 80% and works at 10V and 4kW. If the secondary 
voltage is 240V, then the current in the secondary coil is : 
(1) 1.59A 
(2) 13.33A 
(3) 1.33A 
(4) 15.1A 
Q4 - 2024 (27 Jan Shift 2) 
Primary side of a transformer is connected to 230V, 50Hz supply. Turns ratio of primary 
to secondary winding is 10: 1. Load resistance connected to secondary side is 46O. The 
power consumed in it is : 
(1) 12.5W 
(2) 10.0W 
(3) 11.5W 
(4) 12.0W 
Q5 - 2024 (27 Jan Shift 2) 
A series LCR circuit with L =
100
?? mH, C =
10
-3
?? Fand R = 10O, is connected across an ac 
source of 220V, 50Hz supply. The power factor of the circuit would be 
Q6 - 2024 (29 Jan Shift 2) 
In an a.c. circuit, voltage and current are given by :V = 100sin(100t)V and ?? =
100sin 100?? +
?? 3
 mA respectively. 
The average power dissipated in one cycle is : 
(1) 5W 
(2) 10W 
(3) 2.5W 
(4) 25W 
Q7 - 2024 (29 Jan Shift 2) 
In the given figure, the charge stored in 6?? F capacitor, when points A and B are joined by 
a connecting wire is ?? C. 
 
Q8 - 2024 (30 Jan Shift 1) 
Primary coil of a transformer is connected to 220V ac. Primary and secondary turns of 
the transforms are 100 and 10 respectively. Secondary coil of transformer is connected 
to two series resistance shown in shown in figure. The output voltage  V
0
 is : 
 
 
(1) 7V 
(2) 15V 
(3) 44V 
(4) 22V 
Q9 - 2024 (30 Jan Shift 1) 
A series L, R circuit connected with an ac source ?? = (25sin1000?? )?? has a power factor 
of 
1
 2
. If the source of emf is changed to E = (20sin2000t)V, the new power factor of the 
circuit will be: 
(1) 
1
 2
 
(2) 
1
 3
 
(3) 
1
 5
 
(4) 
1
 7
 
Q10 - 2024 (30 Jan Shift 2) 
An alternating voltage V(t) = 220sin100?? t volt is applied to a purely resistive load of 
50O. The time taken for the current to rise from half of the peak value to the peak value 
is: 
(1) 5ms 
(2) 3.3ms 
(3) 7.2ms 
(4) 2.2ms 
Q11 - 2024 (30 Jan Shift 2) 
Page 5


Q1 - 2024 (01 Feb Shift 1) 
A parallel plate capacitor has a capacitance C = 200pF. It is connected to 230V ac 
supply with an angular frequency 300rad/s. The rms value of conduction current in the 
circuit and displacement current in the capacitor respectively are : 
(1) 1.38?? A a nd 1 .38?? A 
(2) 14.3?? A a nd 1 43?? A 
(3) 13.8?? A n a d 1 38?? A 
(4) 13.8?? A a nd 1 3.8?? A 
Q2 - 2024 (01 Feb Shift 1) 
In series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance 
frequency unchanged, the new inductance should be : 
(1) reduced by 
1
4
L 
(2) increased by 2L 
(3) reduced by 
3
4
L 
(4) increased to 4L 
Q3 - 2024 (01 Feb Shift 2) 
A transformer has an efficiency of 80% and works at 10V and 4kW. If the secondary 
voltage is 240V, then the current in the secondary coil is : 
(1) 1.59A 
(2) 13.33A 
(3) 1.33A 
(4) 15.1A 
Q4 - 2024 (27 Jan Shift 2) 
Primary side of a transformer is connected to 230V, 50Hz supply. Turns ratio of primary 
to secondary winding is 10: 1. Load resistance connected to secondary side is 46O. The 
power consumed in it is : 
(1) 12.5W 
(2) 10.0W 
(3) 11.5W 
(4) 12.0W 
Q5 - 2024 (27 Jan Shift 2) 
A series LCR circuit with L =
100
?? mH, C =
10
-3
?? Fand R = 10O, is connected across an ac 
source of 220V, 50Hz supply. The power factor of the circuit would be 
Q6 - 2024 (29 Jan Shift 2) 
In an a.c. circuit, voltage and current are given by :V = 100sin(100t)V and ?? =
100sin 100?? +
?? 3
 mA respectively. 
The average power dissipated in one cycle is : 
(1) 5W 
(2) 10W 
(3) 2.5W 
(4) 25W 
Q7 - 2024 (29 Jan Shift 2) 
In the given figure, the charge stored in 6?? F capacitor, when points A and B are joined by 
a connecting wire is ?? C. 
 
Q8 - 2024 (30 Jan Shift 1) 
Primary coil of a transformer is connected to 220V ac. Primary and secondary turns of 
the transforms are 100 and 10 respectively. Secondary coil of transformer is connected 
to two series resistance shown in shown in figure. The output voltage  V
0
 is : 
 
 
(1) 7V 
(2) 15V 
(3) 44V 
(4) 22V 
Q9 - 2024 (30 Jan Shift 1) 
A series L, R circuit connected with an ac source ?? = (25sin1000?? )?? has a power factor 
of 
1
 2
. If the source of emf is changed to E = (20sin2000t)V, the new power factor of the 
circuit will be: 
(1) 
1
 2
 
(2) 
1
 3
 
(3) 
1
 5
 
(4) 
1
 7
 
Q10 - 2024 (30 Jan Shift 2) 
An alternating voltage V(t) = 220sin100?? t volt is applied to a purely resistive load of 
50O. The time taken for the current to rise from half of the peak value to the peak value 
is: 
(1) 5ms 
(2) 3.3ms 
(3) 7.2ms 
(4) 2.2ms 
Q11 - 2024 (30 Jan Shift 2) 
A power transmission line feeds input power at 2.3kV to a step down transformer with its 
primary winding having 3000 turns. The output power is delivered at 230V by the 
transformer. The current in the primary of the transformer is 5A and its efficiency is 90%. 
The winding of transformer is made of copper. The output current of transformer is A. 
Q12 - 2024 (31 Jan Shift 2) 
An AC voltage V = 20sin200?? t is applied to a series LCR circuit which drives a current 
I = 10sin 200?? t +
?? 3
 . The average power dissipated is: 
(1) 21.6W 
(2) 200W 
(3) 173.2W 
(4) 50W 
Answer Key 
Q1 (4)  
Q2 (3)  
Q3 (2)  
Q4 (3)  
Q5 (1)  
Q6 (3)  
Q7 (36)  
Q8 (1)  
Q9 (3)  
Q10 (2)  
Q11 (45)  
Q12 (4) 
 
 
Solutions