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16. A piece of wire resistance R is cut into five equal parts out of which four of them are connected to form a square ABCD. The fifth one is connected diagonally across BD. If a battery is connected across AC, what would be the equivalent resistance in the circuit? (NTSE Odisha, Stage-I, 2012-13)
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17. An electric kettle has two thermal coils A and B. When current is passed through A, water in the kettle boils in 6 minutes. When current is passed through B, same volume of water in the kettle boils in 8 minutes. If both A and B would be joined in series and current would be passed, water would boil in (NTSE Odisha, Stage-I, 2012-13)
14 minutes
7 minutes
24 minutes
minutes
18. The ratio of electric field intensity at distance of 5 cm to that of 10 cm from a point charge 5Q in air is (NTSE West Bengal, Stage-I, 2013-14)
2 : 1
1 : 2
1 : 4
4 : 1
19. Five resistances are joined as shown in figure. The equivalent resistance between the points A and C is (NTSE West Bengal, Stage-I, 2013-14)
22
15
10.6
20. One volt is equal to (NTSE West Bengal, Stage-I, 2013-14))
1 J
1 N/C
1 J/C
1 C/N
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minutes
