JEE · Physics · Electrostatics doubts

8 doubts found

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What does “Coulomb's law” actually mean in Electrostatics, and why does it matter for JEE?

the force between two point charges, F = kq₁q₂/r², along the line joining them.

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I keep getting “Coulomb's law” questions wrong in Electrostatics. What's the trap?

ignoring that like charges repel and unlike attract when assigning direction.

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What does “Electric field” actually mean in Electrostatics, and why does it matter for JEE?

the force per unit positive charge, E = F/q; field lines point away from positive charges.

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JEEPhysicsmedium

I keep getting “Electric field” questions wrong in Electrostatics. What's the trap?

treating field (a vector) and potential (a scalar) as the same thing.

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What does “Electric potential” actually mean in Electrostatics, and why does it matter for JEE?

the work done per unit charge to bring a charge from infinity to a point, V = kQ/r.

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JEEPhysicsmedium

I keep getting “Electric potential” questions wrong in Electrostatics. What's the trap?

thinking zero field means zero potential (or vice versa).

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What does “Capacitance” actually mean in Electrostatics, and why does it matter for JEE?

a capacitor's ability to store charge per volt, C = Q/V; for parallel plates C = ε₀A/d.

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JEEPhysicsmedium

I keep getting “Capacitance” questions wrong in Electrostatics. What's the trap?

forgetting a dielectric increases capacitance.

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