Flashcards
electrostatic potential and capacitance
Cards in this deck (27)
- 1electric potentialwork is done to move a unit positive charge from infinity to a point against the electric field.
- 2electrostatic potential energypotential energy per unit charge at a point on the electric field.
- 3electric potential energyamount of work done to move a charge from infinity to a point on the electric field.
- 4examples of a conservative forcespring, gravitational and coulombic force
- 5potential energy differencedelta U = U2-U1
- 62 important points on the potential energy difference1) it is conservative in nature as the value does not depend on the path taken
2)the actual value of potential energy is not physically significant and alpha value can be added at any point. - 7work is done by external force in bringing a unit positive charge from 1 to 2=V2-V1=U2-U1/q
- 8potential due to point chargeV=Q/4 PI E0 r
- 9how do electrostatic potential and electrostatic field varies with rthe electrostatic potential is directly proportional to 1/r
the electrostatic field is directly proportional to 1/r2 - 10work is done in bringing a charge from infinity to point P.W=qV
- 11potential on a dipole axisV=+-1/4 pi e0*p/r2
- 12potential due to the system of charges.v=1/4 pi e0(q1/r+q2/r.......qn/r)
- 13equipotential surfacesit is a surface with a constant value of the potential at all points on the surface.
- 14relation b/w electric field and potential1) electric field is in the direction in which the potential energy decreases the steepest.
2)the test charge is moved in the x-direction, the rate of its change in potential is the value of the electric field. - 15the potential energy of a system of chargesthe work depends only on the arrangement of charges
- 16the potential energy of a dipole in an external fieldin a uniform electric field, the dipole experiences no net force but experiences a torque.
torque=p*E - 17the electrostatic field inside the conductorzero
- 18the electrostatic field at the surface of a charged conductornormal to the surface of every point
- 19interior of a conductor in a static situationno excess charge
- 20electrostatic potential of the conductorhas the same value throughout the volume of the conductor and has the same value on its surface.
- 21the electric field at the surface of a charged conductorE=surface charge density/Enot
- 22electrostatic shieldingany cavity in a conductor remains shielded from outside electric influence
- 23dielectricsnon-conducting substances
- 24capacitora system of 2 conductors separated by an insulator
- 25capacitanceC=Q/V
- 26the potential difference in the uniform field in parallel plate capacitorV=Ed=Qd/ENOTA
- 27—
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- class 12 physics Flashcards on electrostatic potential and capacitance, created by sakhi rathore on 03/08/2020.
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- sakhi rathore
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