Electromagnetic Induction and Alternating Current 7 Question 22
25. Two metallic rings and , identical in shape and size but having different resistivities and , are kept on top of two identical solenoids as shown in the figure. When current is switched on in both the solenoids in identical manner, the rings and jump to heights and , respectively, with . The possible relation(s) between their resistivities and their masses and is (are)
(2009)
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 25. (b, d)
Solution:
- Induced emf
. For identical rings induced emf will be same. But currents will be different. Given .
Hence,
If
If