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JEE Main 2014 Physics question

PhysicsElectric Charges and FieldsJEE Main 2014

A spherically symmetric charge distribution is characterised by a charge density having the following variations: for and for . Where r is the distance from the centre of the charge distribution and is a constant. The electric field at an internal point is:

Answer: (2)

Solution

The charge inside radius r is \int_0^r\frac{r'}{R}\frac{r^3}{3}$ -

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Question ID VK-104540