A combination of capacitors is set up as...

A combination of capacitors is set up as shown in the figure. The magnitude of the electric field, due to a point charge Q (having a charge equal to the sum of the charges on the 4 `mu F` and 9 `mu F` capacitors), at a point distant 30 m from it, would equal :

`360 N//C`

`420 N//C`

`480 N//C`

`240 N//C`

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