Answer:
Explanation:
Coulomb's law states that the force of attraction or repulsion between any two charges is proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between the charges
⇒
∴
where  is the force of attraction or repulsion
 is the force of attraction or repulsion
 is Coulumb's constant=
 is Coulumb's constant=
 and
 and  are the magnitude of the charges
 are the magnitude of the charges
 is the distance between two charges
 is the distance between two charges
The force between the two charges is attractive if they are of different polarity
The force between the two charges is repulsive if they are of same polarity
Question 7:
Given:  ,
, 
By coulomb's law,

⇒
Question 6:
Given:  ,
, 
By coulomb's law,

⇒
 
        
             
        
        
        
Answer:
fixed pulley: A pulley system in which the pulley is attached to a fixed point and the rope is attached to the object. ... movable pulley: A pulley system in which the pulley is attached to the object; one end of the rope is attached to a fixed point and the other end of the rope is free.
Explanation: