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Question : 34
Total: 35
(a) Consider the experimental set up shown in the figure. This jumping ring experiment is an outstanding demonstration of some simple laws of Physics. A conducting non-magnetic ring is placed over the vertical core of a solenoid. When current is passed through the solenoid, the ring is thrown off.
Answer the following questions:
(i) Explain the reason of jumping of the ring when the switch is closed in the circuit.
(ii) What will happen if the terminals of the battery are reversed and the switch is closed? Explain.
(iii) Explain the two laws that help us understand this phenomenon.
OR
(b) Briefly explain various ways to increase the strength of magnetic field produced by a given solenoid.
Answer the following questions:
(i) Explain the reason of jumping of the ring when the switch is closed in the circuit.
(ii) What will happen if the terminals of the battery are reversed and the switch is closed? Explain.
(iii) Explain the two laws that help us understand this phenomenon.
OR
(b) Briefly explain various ways to increase the strength of magnetic field produced by a given solenoid.
Solution: 👈: Video Solution
(a) (i) When the switch is closed, a current flows through the solenoid and an emf is induced in the ring. An induced current flows in the ring.
Lenz's Law states that an induced current always flows in the opposite direction of that which produced it. In other words, the emf induced by the solenoid creates a current in the ring that flows in the opposite direction of the solenoid's current. These opposite currents repel one another, so the ring jumps up being repelled by the solenoid.
(ii) When the battery is reversed, the directions of currents in both solenoid and ring change and the ultimately same phenomenon is observed.
(iii) The laws which explain the phenomenon:
● Faraday's law of electromagnetic induction: An emf is induced in a conductor when it is placed in a varying magnetic field.
● Lenz's law: Induced current flows in a direction such that the current opposes the change that induced it.
OR
(b) Various ways to increase the magnetic field produced by a solenoid:
● By placing a soft iron core.
● By increasing the number of turns per unit length.
● By increasing the strength of current.
Lenz's Law states that an induced current always flows in the opposite direction of that which produced it. In other words, the emf induced by the solenoid creates a current in the ring that flows in the opposite direction of the solenoid's current. These opposite currents repel one another, so the ring jumps up being repelled by the solenoid.
(ii) When the battery is reversed, the directions of currents in both solenoid and ring change and the ultimately same phenomenon is observed.
(iii) The laws which explain the phenomenon:
● Faraday's law of electromagnetic induction: An emf is induced in a conductor when it is placed in a varying magnetic field.
● Lenz's law: Induced current flows in a direction such that the current opposes the change that induced it.
OR
(b) Various ways to increase the magnetic field produced by a solenoid:
● By placing a soft iron core.
● By increasing the number of turns per unit length.
● By increasing the strength of current.
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