10th Class Physics Chapter 4 Electrostatics Short Question Answer
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10th Class Physics Chapter 4 Electrostatics Short Question Answer
Capacitance:
The ability of a capacitor to store charge is called capacitance. It is given by the ratio of charge and the electric potential as. C= Q/VSI unit of capacitance is farad.
Electric potential:
Electric potential is a characteristic of the field of source charge and is independent of a test charge that may be placed in the field.
The rubber and road will get opposite charges.The rubber tires get negatively charged.
Electric field intensity being a force is a vector quantity.
If one coulomb of charge given to the plates of a capacitor produces potential difference on one volt between the plates of the capacitor then its capacitance would be one farad.
Farad is a large unit, usually we use a smaller unit called micro farad and bico farad etc.
Electric field. The electric field is a region around a charge in which it exerts electrostatic force on another charges.
Electron volt is another and more useful unit of electric potential or electric energy.
Potential difference between two points as the energy supplied by a unit charge as it moves from on point to the other in the direction of the field. It unit is volt.
If the potential energy of one coulomb of charge at a point in the electric field is one joule. The potential of that point will be one volt.
Fixed capacitor: Fixed capacitor is a capacitor whose capacitance remains fixed. For example; Paper capacitor and Mica capacitor.
In the presence of charge body an insulated conductor develop positive charge at one end and negative charge at the other end this process is called electrostatic induction.
If one ampere current flow from a wire in one second then its charge willbe one coulomb.
Capacitance of capacitors: The ability of a capacitor to store the charge is called capacitance.
SI unit of capacitance is Farad which is equal to CV-1
During flight, body of an aeroplane gets charged due to frictional forces.
Electrostatic potential at a point in an electric field is equal to the amount of work done in bringing a unit positive charge from infinity to that point.
Mathematically expression: V = W/q
SI unit of electrostatic potential is volt which is equal to JC-1
Some animals produce electric field to detect nearby objects that affect the field.
The electric field intensity at any point is defined as the force acting on unit positive charge placed at the point.
Uses of Capacitors:
i. Capacitors can be use to differentiate between high and low frequency signals.
ii. Capacitors can be use in tuning of radio.
iii. Capacitors can be use in table fans, exhaust fans and fan motors, in air conditioners and coolers etc.
