Three concentric spherical conductors of radii a , 2a , and 3a have charges -Q , +2Q , and -4Q, respectively . If r is the distance of the point under consideration from the centre of the spheres, then find the electric field and potential due to the given configuration , for the values
![](https://sahay.guru/wp-content/uploads/2020/11/1-1-1-1024x662.jpg)
![](https://sahay.guru/wp-content/uploads/2020/11/1-2-1-805x1024.jpg)
![](https://sahay.guru/wp-content/uploads/2020/11/1-3-1-1024x743.jpg)