The electrostatic potential in a charged spherical region of radius 
varies as 
, where 
and 
are constants. The total charge in the sphere of unit radius is 
. The value of 
is 
. (permittivity of vacuum is 
)
Text Solution
Verified by ExpertsThe correct answer is:
B
From 
, the electric field is 
.
By Gauss's law:
, so 
.
This gives 
.
At 
.
Since 
, we have 
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