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General
Easy
Question
A square frame ABCD of side a and a long current carrying conductor PQ are arranged as shown in fig. If the frame moves towards right with a velocity u , the resultant induced e.m.f. in the loop will be
The correct answer is:
Related Questions to study
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The magnet in fig. rotates as shown on a pivot through its centre. At the instant Fig. shown, what is the directions of the induced currents ? (in wood)
The magnet in fig. rotates as shown on a pivot through its centre. At the instant Fig. shown, what is the directions of the induced currents ? (in wood)
physics-General
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There are two coils A and B as shown in fig. What is the direction of the momentary current induced in coil B, when switch S is pressed
There are two coils A and B as shown in fig. What is the direction of the momentary current induced in coil B, when switch S is pressed
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The network shown in fig. is a part of a complex network. When current is 5 A and is decreasing at the rate of 103A/s, then VB-VA will be :
The network shown in fig. is a part of a complex network. When current is 5 A and is decreasing at the rate of 103A/s, then VB-VA will be :
physics-General
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One conducting U tube can slide inside another as shown in fig., maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v then the e.m.f. induced in the circuit in terms of B, I and v where / is the width of each tube, will be
One conducting U tube can slide inside another as shown in fig., maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v then the e.m.f. induced in the circuit in terms of B, I and v where / is the width of each tube, will be
physics-General
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A conductor of length / is moved perpendicular to uniform magnetic field B with velocity v. The e.m.f. induced across the length of the conductor is
A conductor of length / is moved perpendicular to uniform magnetic field B with velocity v. The e.m.f. induced across the length of the conductor is
physics-General
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In a coil of self-inductance 5 H, the rate of change of current is 2 A per sec. then e.m.f. induced in the coil is
In a coil of self-inductance 5 H, the rate of change of current is 2 A per sec. then e.m.f. induced in the coil is
physics-General
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A magnet is made to oscillate with a particular frequency, passing through a coil as shown in fig. The time variation of Fig.
the magnitude of e.m.f. generated across the coil during one cycle is
A magnet is made to oscillate with a particular frequency, passing through a coil as shown in fig. The time variation of Fig.
the magnitude of e.m.f. generated across the coil during one cycle is
physics-General
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A right-angled triangle abc, made from a metallic wire, moves at a uniform speed in its plane as shown in
Figure a uniform magnetic field B exists in the perpendicular direction. Find induced
A right-angled triangle abc, made from a metallic wire, moves at a uniform speed in its plane as shown in
Figure a uniform magnetic field B exists in the perpendicular direction. Find induced
physics-General
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The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20.0 mT/s. Each side of the square loop abcd and defa has a length of 1.00 cm and a resistance of 4.00 
. Find the current (magnitude and sense) in the wire ad if
The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20.0 mT/s. Each side of the square loop abcd and defa has a length of 1.00 cm and a resistance of 4.00 . Find the current (magnitude and sense) in the wire ad if
physics-General
physics-
Assertion : Thermocouple acts as a heat engine.
Reason : When two junctions of thermocouple are at different temperature, thermo e.m.f. is produced.
Assertion : Thermocouple acts as a heat engine.
Reason : When two junctions of thermocouple are at different temperature, thermo e.m.f. is produced.
physics-General
physics-
Assertion : If three identical bulbs are connected in series as shown in figure then on closing the switches. Bulb C short circuited and hence illumination of bulbs A and B decreases.
Reason : Voltage on A and B decreases
Assertion : If three identical bulbs are connected in series as shown in figure then on closing the switches. Bulb C short circuited and hence illumination of bulbs A and B decreases.
Reason : Voltage on A and B decreases
physics-General
physics-
Assertion : In the given circuit if lamp B or C fuses then light emitted by lamp A decreases.
Reason : Voltage on A decreases.
Assertion : In the given circuit if lamp B or C fuses then light emitted by lamp A decreases.
Reason : Voltage on A decreases.
physics-General
physics-
Assertion : In practical application, power rating of resistance is not important.
Reason : Property of resistance remain same even at high temperature.
Assertion : In practical application, power rating of resistance is not important.
Reason : Property of resistance remain same even at high temperature.
physics-General
physics-
Assertion : Two electric bulbs of 50 and 100 W are given. When connected in series 50 W bulb glows more but when connected parallel 100 W bulb glows more.
Reason : In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
Assertion : Two electric bulbs of 50 and 100 W are given. When connected in series 50 W bulb glows more but when connected parallel 100 W bulb glows more.
Reason : In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
physics-General
physics-
Assertion : The electric bulbs glows immediately when switch is on.
Reason : The drift velocity of electrons in a metallic wire is very high.
Assertion : The electric bulbs glows immediately when switch is on.
Reason : The drift velocity of electrons in a metallic wire is very high.
physics-General
