Physics-
General
Easy
Question
In an ac circuit with voltage V and current I, the power dissipated is
- VI
- Depends on the phase between V and I
The correct answer is: Depends on the phase between V and I
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The r.m.s. 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
The r.m.s. 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
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Alternating current can not be measured by dc ammeter because
Alternating current can not be measured by dc ammeter because
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The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4
. Find the current in the wire AB if the switch S is closed
The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4. Find the current in the wire AB if the switch S is closed
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A pair of parallel conducting rails lie at right angle to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 W and 5 are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then
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Two coils P and Q are placed co-axially and carry current I and I' respectively
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A straight wire of length L is bent into a semicircle. It is moved in a uniform magnetic field with speed v with diameter perpendicular to the field. The induced emf between the ends of the wire is
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A conducting loop having a capacitor is moving outward from the magnetic field then which plate of the capacitor will be positive
A conducting loop having a capacitor is moving outward from the magnetic field then which plate of the capacitor will be positive
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Two circular coils A and B are facing each other as shown in figure. The current i through A can be altered
Two circular coils A and B are facing each other as shown in figure. The current i through A can be altered
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In which of the following circuit is the current maximum just after the switch S is closed
In which of the following circuit is the current maximum just after the switch S is closed
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A square coil ABCD lying in x-y plane with it’s centre at origin. A long straight wire passing through origin carries a current i = 2t in negative z-direction. The induced current in the coil is
A square coil ABCD lying in x-y plane with it’s centre at origin. A long straight wire passing through origin carries a current i = 2t in negative z-direction. The induced current in the coil is
Physics-General
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The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field 
(directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f. induced as they move through the field, greatest first
The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field (directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f. induced as they move through the field, greatest first
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Assertion : The induced emf in a conducting loop of wire will be non zero when it rotates in a uniform magnetic field.
Reason : The emf is induced due to change in magnetic flux.
Assertion : The induced emf in a conducting loop of wire will be non zero when it rotates in a uniform magnetic field.
Reason : The emf is induced due to change in magnetic flux.
Physics-General
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A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is
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A square loop of side 5 cm enters a magnetic field with 1 cms-1. The front edge enters the magnetic field at t = 0 then which graph best depicts emf
A square loop of side 5 cm enters a magnetic field with 1 cms-1. The front edge enters the magnetic field at t = 0 then which graph best depicts emf
Physics-General
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Switch S of the circuit shown in figure. is closed at t = 0. If e denotes the induced
emf in L and i, the current flowing through the circuit at time
t, which of the following graphs is correct
Switch S of the circuit shown in figure. is closed at t = 0. If e denotes the induced
emf in L and i, the current flowing through the circuit at time
t, which of the following graphs is correct
Physics-General
