Abug zapper consists of two metal plates connected to a high-voltage power supply. the voltage between the plates is set to give an electric field slightly less than 1×10^6 v/m. when a bug flies between the two plates, it increases the field enough to initiate a spark that incinerates the bug.
if a bug zapper has a 7000 v power supply, what is the approximate separation between the plates?

(a) 7×10-2 cm
(b) 0.7 cm
(c) 7 cm
(d) 70 cm

The separation between the plates is 0.7 cm.

(b) is correct option.

Explanation:

Given that,

Electric filed

Voltage = 7000 V

Electric filed is equal to the voltage divided by the separation between the plates.

We need to calculate the separation between the plates

Using formula of electric field

Where, V = voltage

E = electric field

Put the value into the formula

Hence, The separation between the plates is 0.7 cm.

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more