The flux linked with a circuit is given by ɸ = t 3 + 3t – 7. The graph between time (x-axis) and induced e.m.f.(y-axis) will be

Parabola not through the origin

Straight line through the origin

Straight line with positive intercept

Straight line with negative intercept

JEE Questions for Physics Electromagnetic Induction Quiz 4

Two identical circular loops of metal wire are lying on a table near to each other without touching.Loop A carries a current which increasing with time.In response the loop B.......

0%
Is repelled by loop A
0%
Is attracted by loop A
0%
rotates about its centre of mass
0%
remains stationary

Two identical magnets moving towards a coil, connecting a condenser at rear side shown in fig., with equal speed from opposite sides Then
Physics-Electromagnetic Induction-68714.png

Physics-Electromagnetic Induction-68714.png

0%
Both plate will be positive
0%
There is no charging of condenser
0%
Plate 1 will be positive and 2 negative
0%
Plate 2 will be positive and 1 negative

A rectangular loop with a sliding rod of length 2m & resistance 2Ω. It moves in a uniform magnetic field of 3T perpendicular to plane of loop. The external force required to keep the rod moving with constant velocity of 2ms^-1 is
Physics-Electromagnetic Induction-68715.png

Physics-Electromagnetic Induction-68715.png

0%
2N
0%
4N
0%
6N
0%
8N

As shown in figure after a long time the battery is disconnected and short circuiting the points A & B. The current in circuit after 2ms after the short circuit is.
Physics-Electromagnetic Induction-68716.png

Physics-Electromagnetic Induction-68716.png

0%
0%
2)
0%
0%

The variation of induced emf with time in a coil if a short bar magnet is moved along its axis with constant velocity is.
Physics-Electromagnetic Induction-68722.png

Physics-Electromagnetic Induction-68722.png

0%
0%
2)
0%
0%

A square loop of side 10 cm and resistance 2Ω is moved with velocity v_o as shown in fig. The uniform magnetic field is 3T with what speed should the loop be moved so that a steady current of 1.5 mA flows in the loop.
Physics-Electromagnetic Induction-68727.png

Physics-Electromagnetic Induction-68727.png

0%
1 cms–1
0%
2 cms–1
0%
3 cms–1
0%
4 cms–1

A metal rod of length 2 m rotates vertically about one of its end with frequency 2 Hz. The horizontal component of earth's magnetic field is 3.14 × 10^–5 T then emf developed between two ends of road is.....

0%
0%
2)
0%
0%

Pure inductance of 3H each are connected as shown below. The equivalent inductance of the circuit is
Physics-Electromagnetic Induction-68734.png

Physics-Electromagnetic Induction-68734.png

0%
1 H
0%
2 H
0%
3 H
0%
9 H

A coil of inductance 300 mH and resistance 2Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in.........

0%
0.15 sec
0%
0.3 sec
0%
0.05 sec
0%
0.1sec

The rms value of an ac of 50 Hz is 10 amp.The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be,

0%
0%
2)
0%
0%

An alternating current is given by the equation I = I₁coswt + I₂ sinwt. The rms current is given by,

0%
0%
2)
0%
0%

Physics-Electromagnetic Induction-68743.png

0%
20 watts
0%
40 watts
0%
1000 watts
0%
0 watts

In ac circuit with voltage V and current I, the power dissipated is.

0%
0%
2)
0%
0%
Depends on the phase between V and I

A lamp consumes only 50% of peak power in an ac circuit. What is the phase difference between the applied voltage and the circuit current.

0%
0%
2)
0%
0%

In an ac circuit the emf (e) and the current (i) at any instant core given respectively by e = E_osinωt, I = I_osin(ωt – φ). The average power in the circuit over one cycle of ac is.

0%
0%
2)
0%
0%

Physics-Electromagnetic Induction-68756.png

0%
0%
2)
0%
0%

Physics-Electromagnetic Induction-68761.png

0%
0%
2)
0%
0%

Same current is flowing in two alternating circuits. The first circuits contains only inductance and the other contains only a capacitor. If the frequency of the emf of ac is increased the effect on the value of the current will be.

0%
Increase in the first circuit and dicrease in other
0%
Increase in both the circuit
0%
Decrease in both the circuit
0%
Decrease in the first and increase in other

The value of alternating emf E in the given circuit will be.
Physics-Electromagnetic Induction-68767.png

0%
100 V
0%
20 V
0%
220 V
0%
140 V

Physics-Electromagnetic Induction-68768.png

0%
10 m A
0%
20 m A
0%
40 m A
0%
80 m A

In a region of uniform magnetic induction B = 10^-2 tesla, a circular coil of radius 30 cm and resistance π² ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is,

0%
4π2 mA
0%
30 mA
0%
6 mA
0%
200 mA

The power factor of a good choke coil is

0%
Nearly zero
0%
Exactly zero
0%
Nearly one
0%
Exactly one

When 100 volt dc is applied across a coil, a current of 1A flows through it. When 100 volt ac at 50 cyle s^–1 is applied to the same coil, only 0.5 A current flows. The impedance of the coil is,

0%
100Ω
0%
200Ω
0%
300Ω
0%
400Ω

An LC circuit contains a 20 mH inductor and a 50 μF capacitor with an initial charge of 10 mc. The resistance of the circuit is negligible. At the instant the circuit is closed be t = 0. At what time is the energy stored completely magnetic.

0%
t = 0
0%
t = 1.54 ms
0%
t = 3.14 ms
0%
t = 6.28 ms

In the circuit shown below, the ac source has voltage v = 20 cosωt volts with ω = 2000 rad/sec. The amplitude of the current will be nearest to
Physics-Electromagnetic Induction-68771.png

Physics-Electromagnetic Induction-68771.png

0%
2A
0%
3.3 A
0%
0%

The quality factor of LCR circuit having resistance (R) and inductance (L) at resonance frequency (ω) is given by

0%
0%
2)
0%
0%

The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity w is,

0%
0%
2)
0%
0%

An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω power dissipated in the circuit is,

0%
0%
2)
0%
0%

An inductor L and capacitor C are connected in the circuit as shown in fig. The frequency of the power supply is equal to the resonant frequency of the circuit. Which ammeter will read zero ?
Physics-Electromagnetic Induction-68786.png

Physics-Electromagnetic Induction-68786.png

0%
A1
0%
A2
0%
A3
0%
None of these

In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45^o. The value of c is,

0%
0%
2)
0%
0%

In a series resonant LCR circuit, the voltage across R is 100 V and R= 1kΩ with C = 2μF. The resonant frequency ω is 200 rad/s.At resonance the voltage across L is.

0%
40V
0%
250 V
0%
0%

A coil of inductive reactance 31Ω has a resistance of 8Ω. It is placed in series with a condenser of capacitive reactance 25Ω. The combination is connected to an a.c. source of 110 volt. The power factor of the circuit is.

0%
0.80
0%
0.33
0%
0.56
0%
0.64

The diagram shows a capacitor C and resistor R connected in series to an ac source. V₁ and V₂ are voltmeters and A is an ammeter, consider the following statements.
1. Readings in A and V₂ are always in phase
2. Reading in V₁ is ahead in phase with reading in V₂
3. Reading in A and V₁ are always in phase.
Which of these statements are is correct
Physics-Electromagnetic Induction-68794.png

Physics-Electromagnetic Induction-68794.png

0%
only (
0%
only (
0%
(and (only
0%
(and (only

The reading of ammeter in the circuit shown will be
Physics-Electromagnetic Induction-68796.png

0%
24 A
0%
2.4 A
0%
Zero
0%
1.7 A

In the adjoining circuit the voltmeter whose reading will be zero at resonance is
Physics-Electromagnetic Induction-68798.png

0%
V1
0%
V2
0%
V3
0%
V4

Is it possible
Physics-Electromagnetic Induction-68799.png

0%
Yes
0%
No
0%
can not be predicted
0%
Insufficient data to reply

According to Lenz\'s law of electromagnetic induction

0%
The induced e.m.f. is not in the direction opposing the change in magnetic flux
0%
The relative motion between the coil and magnet produces change in magnetic flux
0%
Only the magnet should be moved towards coil
0%
Only the coil should be moved towards magnet

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

0%
A current will be induced in a coil
0%
No current will be induced in a coil
0%
Only an e.m.f. will be induced in the coil
0%
An e.m.f. and a current both will be induced in the coil

A metallic ring is attached with the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be
Physics-Electromagnetic Induction-68800.png

Physics-Electromagnetic Induction-68800.png

0%
First clockwise then anticlockwise
0%
In clockwise direction
0%
In anticlockwise direction
0%
First anticlockwise then clockwise

A coil having an area A₀ is placed in a magnetic field which changes from B₀ to 4B₀ in a time interval t. The e.m.f. induced in the coil will be

0%
0%
2)
0%
0%

According to phenomenon of mutual inductance

0%
The mutual inductance does not depend on geometry of two coils involved
0%
The mutual inductance depends on the intrinsic magnetic property, like relative permeability of material
0%
The mutual inductance is independent of the magnetic property of the material
0%
Ratio of magnetic flux produced by the coil 1 at the place of the coil 2 and the current in the coil 2 will be different from that of the ratio defined by interchanging the coils.

Two large vertical and parallel metal plates having a separation of 1 cm are connected to a DC voltage source of potential difference X. A proton is released at rest midway between the two plates. It is found to move at 45° to the vertical just after release. Then X is nearly

0%
1 × 10–5 V
0%
1 × 10–7 V
0%
1 × 10–9 V
0%
1 × 10–10 V

The direction of induced e.m.f. during electromagnetic induction is given by

0%
Faraday's law
0%
Lenz's law
0%
Maxwell's law
0%
Ampere's law

The flux linked with a circuit is given by ɸ = t³ + 3t – 7. The graph between time (x-axis) and induced e.m.f.(y-axis) will be

0%
Straight line through the origin
0%
Straight line with positive intercept
0%
Straight line with negative intercept
0%
Parabola through the origin
0%
Parabola not through the origin

As shown in the figure, a magnet is moved with a fast speed towards a coil at rest. Due to this induced electromotive force, induced current and induced charge in the coil is E, I and Q respectively. If the speed of the magnet is doubled, the incorrect statement is
Physics-Electromagnetic Induction-68810.png

Physics-Electromagnetic Induction-68810.png

0%
E increases
0%
I increases
0%
Q remains same
0%
Q increases

A coil having 500 square loops each of side 10 cm is placed normal to a magnetic flux which increases at the rate of 1.0 tesla/second. The induced e.m.f. in volts is

0%
0.1
0%
0.5
0%
1
0%
5

When a magnet is pushed in and out of a circular coil C connected to a very sensitive galvanometer G as shown in the adjoining diagram with a frequency v, then
Physics-Electromagnetic Induction-68812.png

Physics-Electromagnetic Induction-68812.png

0%
Constant deflection is observed in the galvanometer
0%
Visible small oscillations will be observed in the galvanometer if v is about 50 Hz.
0%
Oscillations in the deflection will be observed clearly if v =1 or 2 Hz
0%
No variation in the deflection will be seen if v =1 or 2 Hz

Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures 2T and 3T respectively. the temperature of the middle (Le., second) plate understeady state condition is

0%
0%
2)
0%
0%

A 50 turns circular coil has a radius of 3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field B increased from 0.10 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coils is

0%
1.77 volts
0%
17.7 volts
0%
177 volts
0%
0.177 volts

A coil having an area 2m² is placed in a magnetic field which changes from 1 Wb/m² to 4 Wb/m² in an interval of 2 second. The e.m.f. induced in the coil will be

0%
4 V
0%
3 V
0%
1.5 V
0%
2 V

JEE Questions for Physics Electromagnetic Induction Quiz 4 - MCQExams.com

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Practice Physics Quiz Questions and Answers

JEE Questions for Physics Electromagnetic Induction Quiz 4 - MCQExams.com

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Practice Physics Quiz Questions and Answers

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