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Electromagnetic Induction and Alternating Current

Physics

Previous Years Questions

MCQ (Single Correct Answer)

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A series LCR circuit with inductance 10 H, capacitance 10 $$\mu$$F, resistance 50 $$\Omega$$ is connected to an ac sourc...
NEET 2022
The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is
NEET 2022
The peak voltage of the ac source is equal to
NEET 2022
Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >&...
NEET 2021
A series LCR circuit containing 5.0 H inductor, 80$$\mu$$F capacitor and 40$$\Omega$$ resistor is connected to 230V vari...
NEET 2021
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power lo...
NEET 2021
An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an...
NEET 2021
A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference betw...
NEET 2020 Phase 1
A 40 $$\mu $$F capacitor is connected to a 200 V. 50 Hz ac supply. The rms value of the current on the circuit is, nearl...
NEET 2020 Phase 1
In which of the following devices, the eddy current effect is not used?
NEET 2019
A 800 turn coil of effective area 0.05 m2 is kept. perpendicular to a magnetic filed 5 × 10–5 T. When the plane of the ...
NEET 2019
An inductor 20 mH, a capacitor 100 $$\mu $$F and a resistor 50 $$\Omega $$ are connected in series across a source of em...
NEET 2018
The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This ind...
NEET 2018
A long solenoid of diameter 0.1 m has 2 $$ \times $$ 104 turns per meter. At the centre of the solenoid, a coil of 100 t...
NEET 2017
Figure shows a circuit that contains three identical resistors with resistance R = 9.0 $$\Omega $$ each, two identical i...
NEET 2017
An inductor 20 mH, a capacitor 50 $$\mu F$$ and a resistor 40 $$\Omega $$ are connected in series across a source of emf...
NEET 2016 Phase 1
A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the s...
NEET 2016 Phase 1
A small signal voltage V(t) = V0 sin$$\omega $$t is applied across an ideal capacitor C
NEET 2016 Phase 1
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an ...
NEET 2016 Phase 2
A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate $${{d...
NEET 2016 Phase 2
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for combination ?
NEET 2016 Phase 2
An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be...
AIPMT 2015
A series R-C circuit is connected to an alternating voltage source. Consider two situations : (a)  When capac...
AIPMT 2015
A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resis...
AIPMT 2015 Cancelled Paper
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil i...
AIPMT 2014
A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field ...
AIPMT 2014
A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is
NEET 2013 (Karnataka)
The primary of a transformer when connected to a dc battery of 10 Volt draws a current of 1 mA. The number of turns of t...
NEET 2013 (Karnataka)
A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when...
NEET 2013
A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is
NEET 2013
In a coil of resistance 10 $$\Omega $$, the induced current developed by changing magnetic flux through it, is shown in ...
AIPMT 2012 Mains
In an electrical circuit R, L, C and a.c. voltage source are all connected in series. When L is removed from the circuit...
AIPMT 2012 Prelims
The instantaneous values of alternating current and voltage in a circuit are given as $$i = {1 \over {\sqrt 2 }}$$ sin ...
AIPMT 2012 Mains
The current $$(I)$$ in the inductance is varying with time according to the plot shown in figure. Which one of the foll...
AIPMT 2012 Prelims
A coil of resistance 400 $$\Omega $$ is placed in a magnetic field. If the magnetic flux $$\phi $$ (Wb) linked with the ...
AIPMT 2012 Prelims
A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is...
AIPMT 2011 Mains
The r.m.s. value of potential difference V shown in the figure is ...
AIPMT 2011 Mains
The current $$i$$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be ...
AIPMT 2011 Prelims
An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal...
AIPMT 2011 Prelims
In the ac circuit an alternating voltage e = $$200\sqrt 2 $$sin100t volts is connected to a capacitor of capacity 1 $$\m...
AIPMT 2011 Prelims
A condenser of capacity C is charged to a potential difference of V1. The plates of th condenser are then connected to a...
AIPMT 2010 Mains
A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the eff...
AIPMT 2010 Prelims
In the given circuit the reading of voltmeter V1 and V2 are 300 volts each. The reading of the voltmeter V3 and ammeter ...
AIPMT 2010 Prelims
A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. ...
AIPMT 2010 Prelims
Power dissipated in an LCR series circuit connected to an A.C. source of emf $$\varepsilon $$ is
AIPMT 2009
A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic fie...
AIPMT 2009
A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic...
AIPMT 2009
In an a.c. circuit the e.m.f. ($$\varepsilon $$) and the current (i)  at any instant are given respectively b...
AIPMT 2008
A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction $${1 \over \pi }\left( {{{Wb} \ov...
AIPMT 2008
A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with ...
AIPMT 2008
The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux $$\phi $$ lin...
AIPMT 2007
What is the value of inductance L for which the current is maximum in a series LCR circuit with C = 10 $$\mu $$F and $$\...
AIPMT 2007
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency...
AIPMT 2007
A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in seri...
AIPMT 2006
The core of a transformer is laminated because
AIPMT 2006
A coil of inductive reactance 31 $$\Omega $$ has a resistance of 8 $$\Omega $$. It is placed in series with a condenser ...
AIPMT 2006
Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completel...
AIPMT 2006
As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. $$V$$ volt is ind...
AIPMT 2005
In a circuit L, C and R are connected in series with an alternating voltage source of frquency $$f.$$ The current leads ...
AIPMT 2005
The magnetic flux through a circuit of resistance R changes by an amount $$\Delta $$$$\phi $$ in a time $$\Delta $$t. Th...
AIPMT 2004
A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the ter...
AIPMT 2004
For a series LCR circuit the power loss at resonance is
AIPMT 2002
A capacitor of capacity C has reactance X. If capacitance and frequency become double then reactance will be
AIPMT 2001
For a coil having L = 2 mH, current flow through it is $$I = {t^2}{e^{ - t}}$$ then, the time at which emf become zero
AIPMT 2001

MCQ (More than One Correct Answer)

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The value of quality factor is
AIPMT 2001

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