NEET · Physics · Electrostatic Potential & Capacitance doubts
7 doubts found
A dielectric slab is inserted into a charged capacitor. How do I know whether stored energy rises or falls?
Do not start from a memorised result; identify the connection.
Why is the equivalent capacitance in series smaller than the smallest individual capacitor?
In series, every capacitor carries the same charge Q, but the total voltage is the sum of each Q/C_i.
What does “Potential as energy per charge” actually mean in Electrostatic Potential & Capacitance, and why does it matter for NEET?
Electric potential at a point is potential energy per unit test charge. Because it is a scalar, contributions from many source charges add algebraically with their signs.
I keep getting “Potential as energy per charge” questions wrong in Electrostatic Potential & Capacitance. What's the trap?
adding potentials as vectors or dropping the sign of a negative source charge.
What does “Field-potential relationship” actually mean in Electrostatic Potential & Capacitance, and why does it matter for NEET?
The electric field points in the direction in which potential decreases most rapidly. Along one dimension E_x = -dV/dx; the minus sign carries the direction information.
I keep getting “Field-potential relationship” questions wrong in Electrostatic Potential & Capacitance. What's the trap?
assuming electric field points toward higher potential.
What does “Equipotential surfaces” actually mean in Electrostatic Potential & Capacitance, and why does it matter for NEET?
Moving a charge along an equipotential surface requires no work by or against the electrostatic field. Electric-field lines cross equipotentials at right angles.