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61. If current through a resistance is increased by 100% Simultaneously reducing resistance value to 25%, the new power dissipated will be (NTSE Haryana, Stage-I, 2015-16)
No change
Increased by 100%
Decreased by 400%
Increased by 400%
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62. A resistance wire of uniform cross section is in the form of a ring. The two diametrically opposite points are connected through a source of emf via an ammeter. A conducing wire is now connected across AB, A1B3 and then A2B2, one by one, if ammeter reads l1 l2 & l3 respectively (NTSE Haryana, Stage-I, 2015-16)
l1 > l2 > l3
l3 > l2 > l1
l1 = 0, l2 > l3
l3 = 0, l1 < l2
63. The equivalent resistance between P and Q in figure-1 will be (NTSE Chhattisgarh, Stage-I, 2016-17)
7 Ω
2 Ω
Ω
1 Ω
64. An electric bulb rated for 500 W at 100 V is used in a circuit having a 200 V supply. The resistance 'R' that must be kept in series with the bulb so that the bulb draws 500 W is (NTSE Andhra Pradesh, Stage-I, 2015-16)
30 Ω
5 Ω
10 Ω
20 Ω
65. A uniform wire of resistance 100 Ω is melted and made in the form of uniform wire, whose length is double that of the original. The resistance of the new wire is (NTSE Andhra Pradesh, Stage-I, 2015-16)
200√2 Ω
800 Ω
200 Ω
400 Ω
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