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Science Preparation for Engineering Entrance
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The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R. The charge density [charge per unit volume] is dependent only on the radial distance r from the centre of the nucleus as shown in figure. The electric field is only along the radial direction.

Figure :


For a = 0, the value of d (maximum value of as shown in the figure) is

 

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Anushka

The answer to this question should be option b .you have solved it correctly till the end and in the last step you have not written 4 in the denominator after cross multiplying . it should hence be option b .please tell if i am wrong or right ?