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Post a LessonAnswered on 06 Apr Learn CBSE/Class 12/Science/Physics/Unit 4-Electromagnetic Induction & Alternating Current
Sadika
To determine the direction of the induced current in the metallic loop when the electric current flows from B to A in the wire, we can apply Lenz's law.
Lenz's law states that the direction of the induced current is such that it opposes the change in magnetic flux that produced it.
In this case, when the current flows from B to A in the wire, it generates a magnetic field around the wire in the clockwise direction (using the right-hand grip rule). This magnetic field will intersect with the metallic loop.
Now, according to Faraday's law of electromagnetic induction, the change in magnetic flux through the loop induces an electromotive force (emf) and consequently an induced current.
To oppose the increase in the magnetic flux caused by the current flowing from B to A, the induced current in the metallic loop must generate its own magnetic field. By the right-hand rule, this induced magnetic field should be in the counterclockwise direction.
Therefore, the induced current in the metallic loop will flow in such a way that it generates a magnetic field in the counterclockwise direction, opposing the increase in magnetic flux caused by the current in the wire.
In summary, the induced current in the metallic loop will flow in the counterclockwise direction.
Answered on 06 Apr Learn CBSE/Class 12/Science/Physics/Unit 4-Electromagnetic Induction & Alternating Current
Sadika
The time it takes for an object to fall freely from a certain height above the ground depends solely on its mass and the acceleration due to gravity, assuming air resistance is negligible.
Both the metallic and glass bobs have the same size, and when they are allowed to fall freely, they experience the same gravitational force. Since the gravitational force depends on the mass of the object, and both bobs have the same size, they will experience the same gravitational force regardless of their material composition.
Therefore, both the metallic and glass bobs will reach the ground at the same time when allowed to fall freely from the same height above the ground. This is because they experience the same gravitational acceleration and have the same mass (assuming their densities are equal, which is a reasonable assumption for objects of the same size).
Answered on 06 Apr Learn CBSE/Class 12/Science/Physics/Unit 4-Electromagnetic Induction & Alternating Current
Sadika
When the flexible wire of irregular shape is placed in a region with a magnetic field directed normal to the plane of the loop and away from the reader, the magnetic flux through the loop changes.
According to Faraday's law of electromagnetic induction, a changing magnetic flux through a loop induces an electromotive force (emf) and consequently an induced current in the loop.
In this case, as the wire turns into a circular shape, the area of the loop enclosed by the wire increases. This increase in the area of the loop results in a change in the magnetic flux passing through the loop.
To oppose the increase in magnetic flux caused by the expansion of the loop, the induced current will flow in such a way that it generates a magnetic field opposing the external magnetic field.
Using the right-hand rule for the direction of induced current, if we imagine the magnetic field lines pointing away from us (as mentioned in the question), the induced current will flow in a clockwise direction in the circular loop. This is because the induced current will generate a magnetic field that opposes the external magnetic field, thereby resisting the increase in magnetic flux through the loop.
Therefore, the direction of the induced current in the wire will be clockwise in the circular loop.
Answered on 06 Apr Learn CBSE/Class 12/Science/Physics/Unit 4-Electromagnetic Induction & Alternating Current
Sadika
When a bar magnet is quickly moved towards a conducting loop with a capacitor, the magnetic field passing through the loop changes. According to Faraday's law of electromagnetic induction, this change in magnetic flux induces an electromotive force (emf) and consequently an induced current in the loop.
To determine the polarity of the plates A and B of the capacitor, we can consider Lenz's law, which states that the direction of the induced current is such that it opposes the change in magnetic flux that produced it.
When the bar magnet is moved towards the conducting loop, the magnetic flux through the loop increases. In response to this change, the induced current in the loop will flow in such a way that it creates a magnetic field opposing the change in magnetic flux.
Using the right-hand rule, we can determine the direction of the induced current. If the bar magnet is approaching the loop, the induced current will flow in such a way that it creates a magnetic field that opposes the approaching magnetic field of the bar magnet.
By the right-hand rule, the induced current will create a magnetic field that flows in the opposite direction to the approaching magnetic field of the bar magnet. This means that the induced current will generate a magnetic field that points away from the approaching magnet.
According to the right-hand rule for the direction of the magnetic field around a current-carrying conductor, the induced current will circulate counterclockwise in the conducting loop.
Now, let's consider the capacitor. When a current flows through a capacitor, it charges the plates of the capacitor. The direction of the induced current in the loop will cause positive charge to accumulate on plate A and negative charge to accumulate on plate B of the capacitor.
Therefore, plate A of the capacitor will have a positive polarity, and plate B will have a negative polarity.
Answered on 06 Apr Learn CBSE/Class 12/Science/Physics/Unit 4-Electromagnetic Induction & Alternating Current
Sadika
Lenz's law states that the direction of the induced electromotive force (emf) in a circuit is such that it opposes the change in magnetic flux that produced it.
When a metallic rod held horizontally along the east-west direction is allowed to fall under gravity, it will experience a change in magnetic flux if there is a magnetic field present in the vicinity of the rod. However, for the scenario described, assuming there is no external magnetic field, there will be no change in magnetic flux experienced by the rod as it falls.
Since there is no change in magnetic flux, according to Faraday's law of electromagnetic induction, there will be no induced electromotive force (emf) generated in the rod. Faraday's law states that the emf induced in a circuit is directly proportional to the rate of change of magnetic flux through the circuit. If there is no change in magnetic flux, there will be no induced emf.
Therefore, in this scenario, as the metallic rod falls under gravity along the east-west direction without encountering any external magnetic field, there will be no emf induced at its ends.
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