Answer:
The electric field intensity at the aircraft is

Step-by-step explanation:
Given that,
Altitude = 2000 m
Charge = +40 C
At the position of the airplane, the electric field will be due to both the positive and negative charges and will be downwards due to both the charges.
The position is equidistant from both the charges.
We need to calculate the resultant electric field
The contribution due to the positive charge at 3000 m altitude
Using formula of electric field

Put the value into the formula


The contribution due to the negative charge at 1000 m altitude
Using formula of electric field


We need to calculate the electric field intensity at the aircraft
The resultant electric field is

Put the value into the formula


Hence, The electric field intensity at the aircraft is
