# 10th Class Physics Chapter 4 Electrostatics Short Question Answer

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## 10th Class Physics Chapter 4 Electrostatics Short Question Answer

### What do you mean by the capacitance of capacitor? Define units of 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.

### Difference between Electric potential and Potential energy.

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.

### Rubber tires get charged form friction with the road what is the polarity of the charge?

Answer : The rubber and road will get opposite charges.The rubber tires get negatively charged.

### Is electric intensity a vector quantity?

Answer : Electric field intensity being a force is a vector quantity.

### Define Farad.

Answer : 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.

### What is meant by electric field and electric intensity?

Answer : Electric field. The electric field is a region around a charge in which it exerts electrostatic force on another charges.

### What is the unit of electric potential or electric energy?

Answer : Electron volt is another and more useful unit of electric potential or electric energy.

### How would you define potential difference between two points?

Answer : 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.

### Define volt.

Answer : 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.

### Differentiate between fixed and variable capacitors.

Answer : Fixed capacitor: Fixed capacitor is a capacitor whose capacitance remains fixed. For example; Paper capacitor and Mica capacitor.

### What is meant by electrostatic induction?

Answer : 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.

### Define coulomb?

Answer : If one ampere current flow from a wire in one second then its charge willbe one coulomb.

### Define capacitance of capacitors. Write its expression and S.I. unit.

Answer : 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

### What the body of an aeroplane get charged during flight?

Answer : During flight, body of an aeroplane gets charged due to frictional forces.

### Define electrostatic potential also write its expression?

Answer : 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

### How electric field helpful for some animals?

Answer : Some animals produce electric field to detect nearby objects that affect the field.

### Define electric field intensity. Also write its mathematical expression and S.I unit.

Answer : The electric field intensity at any point is defined as the force acting on unit positive charge placed at the point.