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CBSE Class 12 Pre Board 2024 : Physics (Velammal Vidyalaya, Madurai) : PRE BOARD

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PB23PHY02MS KENDRIYA VIDYALAYA SANGATHAN ERNAKULAM REGION PREBOARD I 2023-24 CLASS XII : PHYSICS MARKING SCHEME SECTION A 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. a c c b b b b b d b c b 1 1 1 1 1 1 1 1 1 1 1 1 13. 14. 15. 16. b c d c 1 1 1 1 SECTION B 17. 18. (i) For points inside the balloon , E = 0 (ii) As the balloon is blown up, surface charge density decreases and so electric field on its surface decreases. E/(12+r) = 0.5 E/(25+r) = 0.25 1 1 Solving r = 1 and E = 6.5 V 1

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