JEE Main & Advanced
JEE Main Paper (Held On 11 April 2014)
question_answer
A cone of base radius R and height h is located in a uniform electric field \[\overset{\to }{\mathop{E}}\,\] parallel to its base. The electric flux entering the cone is:
[JEE Main Online Paper ( Held On 11 Apirl 2014 )
A)\[\frac{1}{2}EhR\]
B)her
C)2 E h R
D)4 E h R
Correct Answer:
B
Solution :
Electric flux, \[\phi =E(ds)cos\theta \] \[=E(hR)\text{ }cos0{}^\circ =EhR\]