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QAIPMT-2008-Ph-2274: NEET 2008 Physics - Class 12 AIPMT-2008-Ph-2274 Solution: A shell of mass 200 gm is ejected from a gun of mass 4 kg by an …

A shell of mass 200 gm is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is: 40 ms−140\ \text{ms}^{-1} 120 ms−1120\ \text{ms}^{-1} 100 ms−1100\ \text{ms}^{-1} 80 ms−180\ \text{ms}^{-1}

Multiple Choice Options

  • A 60506050 6050 Ω\Omega �
  • B 4450 Ω4450\,\Omega 4450 �
  • C 5050 Ω5050\,\Omega 5050 �
  • D 5550 Ω5550\,\Omega 5550 �

Step-by-Step Verified Solution

Total initial resistance = R G + R 1 = (50 + 2950) � = 3000 � _ = 3 V _ Current = 3 V 3000 � = 1 _ 10 _ 3 m A If the deflection has to be reduced to 20 divisions, current i = 1 mA _ 2 3 as the full deflection scale for 1 mA = 30 divisions. 3 V = 3000 � _ 1 m A = x � _ 2 3 m A _ x = 3000 _ 1 _ 3 2 = 4500 � But the galvanometer resistance = 50 � Therefore the resistance to be added = (4500 � 50) � = 4450 � .

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