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 distance 30 m from it, would equal:

A

360 N/C

B

420 N/C

C

480 N/C

D

240 N/C

Verified by Experts

The correct Answer is:

B

`Q_(1)=((3)/(5))xx5xx8muC=24muC,Q_(2)=(9)/(12)xx24=18muC`
`E=9xx10^(9)xx(42xx10^(-6))/(900)=420N//C`.

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