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 µF and 9 µF capacitors), at a point distant 30 m from it, would equal : Option 1)  240 N/C   Option 2) 360 N/C   Option 3)  420 N/C   Option 4)  480 N/C

As we learnt in

Series Grouping -

- wherein

Parallel Grouping -

- wherein

Electric Field Intensity -

- wherein

are in parallel combinations so their equivalent capacitance is

Now  are in series sso their equivalent capacitance

Charge on  =

Charge on  are same

as they are in series

Charge on

Now  required charge on Q = charge on       +     charge on

Option 1)

240 N/C

Incorrect

Option 2)

360 N/C

Incorrect

Option 3)

420 N/C

Correct

Option 4)

480 N/C

Incorrect

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