No, on giving charge continuously to a capacitor, the p.d across its plates will go on rising and ultimately the insulation of the medium between the plates will break. Then the capacitor will be discharged giving sparking
Since the battery remains connected, the potential difference V between the plates of the capacitor will remain constant.
Now Since Capacitance depends on the distance between the plates, it will decrease with the movement.
Now we know that
Q=CV
Now C is decreasing and V remains constant, the charge will decrease on the capacitor.
Some charges from plates passing through the connecting wire will charge the battery.
Thus some energy of the capacitor will be transferred to the battery. So energy of the capacitor will decrease.
The work done done in moving apart the plates will be used up in this transference and dissipated in the form of heat in the connecting wires
The process of giving positive charge involves removal of electrons and that of negative charge involves addition of electrons. Hence the mass of the positively charged sphere will be less than that of negatively charged sphere
(a)
(a)
It can be applied to electric Field, electric potential and electric force
The absence of electric field inside the charged conductors means that electric lines of force cannot enter the empty space of any hollow conductor. Thus hollow conductor can be used to acts as electrostatic shield. So sensitive electric instruments can be saved from external electric fields by covering them with hollow conductor.
(a)
(a),(b) and (c)
(a)
(a) (b) and (d)
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Electric Generators |
Electric Motors |
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Device which converts mechanical energy into electrical energy |
Device which converts electrical energy into mechanical energy |
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It is based on Electromagnetic Induction Principle |
It is based on moving coil galvanometer |
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When a closed coil is rotated rapidly in a strong magnetic field ,the magnetic flux through the coil changes continuously .Hence an EMF is induced in the coil and current flows in it in a direction by Fleming right hand rule |
When a current is passed through a coil in a magnetic field ,the coil experiences a torque in the direction given by Fleming left hand rule. This torque gives a continuous rotatory motion in the coil in the magnetic field |
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Two types AC dynamo and DC dynamo |
Back Emf is also generated in Motor since it cuts the magnetic flux of the field magnet |
(a)It is the ratio of the capacitance ($C_0$) of a capacitor with dielectric between the plates to the capacitance ($C_r$) of the same capacitor with vacuum between the plates i.e. $K=\frac {C_r}{C_0}$
(b) It is the product of the magnitude of one of the point charges constitting the dipole ant the distance of separation between two point charges.
(c) Electric flux through an area is the product of the magnitude of the area and the component of electric field vector normal to this area element.
Electric flux = E.ds
SI unit of flux is $NCm^2$
An electric field EP is induced inside the dielectric in a direction opposite to the direction of external electric field E0. Thus net field becomes
$E=E_0-E_P$
Electric field lines can not be discontinous because if they are discontinous then it will indicate the absence of electric field at the break point.
It is so because if they cross each other then at the point of intersection there will be two tangents which is not possible.
The net charge of a charged capacitor is zero because the charges on its two plates are equal in number and opposite in sign. Even when the capacitor is discharged net charge of the capacitor remains zero because then each plate has zero charge.
