CBSE 2023 · Region 2 · Set 3 · Q34 · 4 marks
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.Briefly explain various ways to increase the strength of magnetic field produced by a given solenoid.
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.
Briefly explain various ways to increase the strength of magnetic field produced by a given solenoid.
Marking-scheme solution
(i) Explanation of a jumping of ring
(ii) Explanation of outcome on changing terminals of battery
(iii) Explanation of two laws
OR
(b) Two ways to increase strength of magnetic field produced by solenoid - $\displaystyle 1$+$\displaystyle 1$
(i) The direction of induced current in the ring is such that the polarity developed in the ring is same as that of the polarity on the face of the coil, hence it will jump up due to repulsive force.
(ii) The polarity of the induced current in the ring will get reversed on changing the terminals of the battery, so the ring will jump again.
(iii) Lenz's law It states that the polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produces it.
Faraday's law of EMI Whenever there is change in magnetic flux through a coil, an emf is induced. The magnitude of the induced emf in a coil is equal to the time rate of change of magnetic flux through the coil.
Electromagnetic InductionLenz’s Law and Conservation of EnergyUnderstandcase_studymedium
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.