171. A large magnet is broken into two pieces. If lengths of two pieces are in the ratio of 3 : 4 what is the ratio of their pole strengths?

1. 1. 3 : 4

   
   
   

   2. 4 : 3

   
   
   

   3. 1 : 1

   
   
   

   4. 3 : 2

   
   
   

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   N/A

   Correct Option: C

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172. Magnetic permeability is maximum for

1. 1. Diamagnetic substances

   
   
   

   2. Paramagnetic substances

   
   
   

   3. Ferromagnetic substances

   
   
   

   4. All of the above

   
   
   

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   N/A

   Correct Option: C

   N/A

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173. The susceptibility of diamagnetic material

1. 1. Decreases with temperature

   
   
   

   2. Does not vary with temperature

   
   
   

   3. Increases with temperature

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: B

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174. Order to increases the current sensitivity of a moving coil galvanometer the

1. 1. Number of turns of the coil should be icreased

   
   
   

   2. Strength of the magnetic field should be increased

   
   
   

   3. Area of the coil should be increased

   
   
   

   4. All of the above

   
   
   

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   N/A

   Correct Option: D

   N/A

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175. A charged particle is moving with velocity V in magnetic field of induction B. The force on the particle will be maximum when

1. 1. V and B are in same direction

   
   
   

   2. V and B are opposite direction

   
   
   

   3. V and B are perpendicular

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: C

   N/A

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