What is the Force Between Two Small Charged Spheres - Physics

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What is the force between two small charged spheres having charges of 2 × 10−7 C and 3 × 10−7 C placed 30 cm apart in air?

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Repulsive force of magnitude 6 × 10−3 N

Charge on the first sphere, q1 = 2 × 10−7 C

Charge on the second sphere, q2 = 3 × 10−7 C

Distance between the spheres, r = 30 cm = 0.3 m

Electrostatic force between the spheres is given by the relation,


Where, ∈0 = Permittivity of free space

`1/(4piin_0)=9xx10^9 Nm^2C^-2`


Hence, the force between the two small charged spheres is 6 × 10−3 N. The charges are of the same nature. Hence, the force between them will be repulsive.

Concept: Superposition Principle - Forces Between Multiple Charges
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NCERT Physics Part 1 and 2 Class 12
Chapter 1 Electric Charges and Fields
Exercise | Q 1.1 | Page 46
NCERT Class 12 Physics Textbook
Chapter 1 Electric Charge and Fields
Exercise | Q 1 | Page 46

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