Physics-
General
Easy
Question
Lenz’s law applies to
- Electrostatics
- Lenses
- Electro-magnetic induction
- Cinema slides
The correct answer is: Electro-magnetic induction
Related Questions to study
Physics-
A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will
A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will
Physics-General
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Lenz's law gives
Lenz's law gives
Physics-General
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A 50 turns circular coil has a radius of 
, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field 
increased from 0.10 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coil is
A 50 turns circular coil has a radius of , it is kept in a magnetic field acting normal to the area of the coil. The magnetic field increased from 0.10 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coil is
Physics-General
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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 
, then
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 , then
Physics-General
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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 
and 
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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 and respectively. If the speed of the magnet is doubled, the incorrect statement is
Physics-General
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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
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-General
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The length of a magnet is large compared to it's width and breadth. The time period of its oscillation in a vibration magnetometer is T. The magnet is cut along it’s length into six parts and these parts are then placed together as shown in the figure. The time period of this combination will be
The length of a magnet is large compared to it's width and breadth. The time period of its oscillation in a vibration magnetometer is T. The magnet is cut along it’s length into six parts and these parts are then placed together as shown in the figure. The time period of this combination will be
Physics-General
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Two short magnets of magnetic moment 1000 
are placed as shown at the corn ers of a square of side 10 cm. The net magnetic induction at P is
Two short magnets of magnetic moment 1000 are placed as shown at the corn ers of a square of side 10 cm. The net magnetic induction at P is
Physics-General
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A magnet is suspended horizontally in the earth's magnetic field. When it is displaced and then released it oscillates in a horizontal plane with a period T. If a place of wood of the same moment of inertia (about the axis of rotation) as the magnet is attached to the magnet what would the new period of oscillation of the system become
A magnet is suspended horizontally in the earth's magnetic field. When it is displaced and then released it oscillates in a horizontal plane with a period T. If a place of wood of the same moment of inertia (about the axis of rotation) as the magnet is attached to the magnet what would the new period of oscillation of the system become
Physics-General
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Three identical bar magnets each of magnetic moment M are placed in the form of an equilateral triangle as shown. The net magnetic moment of the system is
Three identical bar magnets each of magnetic moment M are placed in the form of an equilateral triangle as shown. The net magnetic moment of the system is
Physics-General
Physics-
A magnetised wire of moment M is bent into an arc of a circle subtending an angle of 60° at the centre; then the new magnetic moment is
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Physics-General
Physics-
The distance between the poles of a horse shoe magnet is 0.1 m and its pole strength is 0.01 amp-m. The induction of magnetic field at a point midway between the poles will be
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Physics-General
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Assertion : The tangent galvanometer can be made more sensitive by increasing the number of turns of its coil.
Reason : Current through galvanometer is proportional to the number of turns of coil.
Assertion : The tangent galvanometer can be made more sensitive by increasing the number of turns of its coil.
Reason : Current through galvanometer is proportional to the number of turns of coil.
Physics-General
Physics-
14 The most appropriate magnetization M versus magnetising field H curve for a paramagnetic substance is
14 The most appropriate magnetization M versus magnetising field H curve for a paramagnetic substance is
Physics-General
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The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the graph
The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the graph
Physics-General
