31. A horizontal cable carries a current from west to east. the direction of the magnetic field produced by the current at a point vertically above the wire is

1. 1. South to north

   
   
   

   2. North to south

   
   
   

   3. East to west

   
   
   

   4. West to east

   
   
   

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   N/A

   Correct Option: B

   N/A

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32. The SI unit of pole strength is

1. 1. Am²

   
   
   

   2. Am^-1

   
   
   

   3. Am^-2

   
   
   

   4. Am

   
   
   

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   N/A

   Correct Option: D

   N/A

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33. A magnetic needle is kept in non uniform magnetic field. It experiences

1. 1. A force and a torque

   
   
   

   2. A force but not a torque

   
   
   

   3. A torque but not a force

   
   
   

   4. None of these

   
   
   

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   N/A

   Correct Option: A

   N/A

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34. A source of magnetic field is

1. 1. A static electric charge

   
   
   

   2. A moving electric charge

   
   
   

   3. A current loop

   
   
   

   4. Both (b) and (c)

   
   
   

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   N/A

   Correct Option: D

   N/A

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35. Conversion of chemical energy into electrical energy occurs in

1. 1. Atomic bombs

   
   
   

   2. Electric heaters

   
   
   

   3. Battery

   
   
   

   4. Dyname

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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