Calculating Electric Field Strength Between Two Point Charges

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To calculate the electric field strength at the midpoint between a +7.5 nC and a -2.0 nC point charge separated by 3.0 cm, use the formula E = k * q / r^2, where k is Coulomb's constant (9 x 10^9 N m²/C²). The distance r is half of the total separation, which is 1.5 cm or 0.015 m. Each charge contributes to the electric field at the midpoint, and the signs of the charges must be considered, as they affect the direction of the field. The electric field strength is the vector sum of the fields due to both charges at that point. Understanding the contributions from both charges is essential for accurate calculations.
jokester4u
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A +7.5 nC point charge and a -2.0 point charge are 3.0 cm apart. What is the electric field strength at the midpoint between the two charges?

just give me the formula ?
 
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whts is q ? and how do i find q from the question ?
 
jokester4u said:
whts is q ? and how do i find q from the question ?

q is a point charge. Your problem gives two of them. r is the distance from q to the midpoint. Pay attention to the signs of each q.
 
can you tell me the exact way to solve it ?
 
jokester4u said:
can you tell me the exact way to solve it ?

We're not allowed to do that.

Please reflect on what I said so far.
 

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