Solved papers for JEE Main & Advanced JEE Main Paper (Held On 10 April 2015)

done JEE Main Paper (Held On 10 April 2015) Total Questions - 1

• question_answer1) A thin disc of radius b = 2a has a concentric hole of radius \['\sigma '\] in it (see figure). It carries uniform surface charge 'w' on it. If the electric field on its axis at height 'h' (h<<a) from its centre is given as \['C\overset{\scriptscriptstyle\smile}{h}'\]then value  of ?C? is: JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[\frac{\sigma }{a{{\varepsilon }_{0}}}\]                               
  done clear
  B)
  \[\frac{\sigma }{4a{{\varepsilon }_{0}}}\]
  done clear
  C)
  \[\frac{\sigma }{2a{{\varepsilon }_{0}}}\]                             
  done clear
  D)
  \[\frac{\sigma }{8a{{\varepsilon }_{0}}}\]
  done clear
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