All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2009 Physics

Q.28. The magnitude of the magnetic field (B) due to the loop ABCD at the origin (O) is:

1. 
   
2. Zero
   
   
3. 
   
   
4.  

Sol:  
  

Answer: (3)

 Q.29. Due to the presence of the current I1 at the origin :

1. The magnitude of the net force on the loop is given by
   
   
2. The forces on AB and DC are zero
   
   
3. The forces on AD and BC are zero
4. The magnitude of the net force on the loop is given by

Sol.: Due to current I1, force on DA and BC will be zero

Answer: (3)

Q.30. The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions:

Where  is the energy released? In which reactions is positive?

1. (ii) and (iii)
   
   
2. (i) and (iv)
   
   
3. (i) and (iii)
   
   
4. (ii) and (iv)

 Answer: (2)