# Q 1.24(a): Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude $17\times 10^{-22}\frac{C}{m^{2}}$ What is E: (a) in the outer region of the first plate

We know, electric field, E, due to an infinite plate (length>>thickness) having surface charge density $\sigma$  =    $\sigma/2\epsilon_{0}$ .

(To note: It's independent of distance from the plate!)

In region outside first plate,

Since, both plates have same surface charge density(in magnitude only), their electric fields are same in magnitude in this region but opposite in direction.

(E due to positive plate away from it and E due to negative plate towards it!)

Hence,  Electric field in the outer region of the first plate is Zero.

## Related Chapters

### Preparation Products

##### Knockout KCET 2021

An exhaustive E-learning program for the complete preparation of KCET exam..

₹ 4999/- ₹ 2999/-
##### Knockout KCET JEE Main 2021

It is an exhaustive preparation module made exclusively for cracking JEE & KCET.

₹ 27999/- ₹ 16999/-
##### Knockout NEET Sept 2020

An exhaustive E-learning program for the complete preparation of NEET..

₹ 15999/- ₹ 6999/-
##### Rank Booster NEET 2020

This course will help student to be better prepared and study in the right direction for NEET..

₹ 9999/- ₹ 4999/-