Answer:
Rate of change of magnetic field is  
         
Explanation:
We have given diameter of the circular loop is 13 cm = 0.13 m 
So radius of the circular loop 
Length of the circular loop 
Wire is made up of diameter of 2.6 mm
So radius 
Cross sectional area of wire 
Resistivity of wire 
Resistance of wire 
Current is given i = 11 A
So emf  
Emf induced in the coil is 


 
        
             
        
        
        
Answer:
they differ each other bc it is a lot of with earth quakes and everything.
Explanation:
 
        
             
        
        
        
Answer:
71 % of the earth's surface is covered in water
 
        
                    
             
        
        
        
Answer:
The negative electrode of a battery has an excess of positive charge
Explanation:
This is because in every battery, there is a negative electrode ( cathode ) and only positive charge is deposited on it.
 For other statements:
Batteries donot store electric charge but they store chemical energy
Some batteries donot use metals for the flow of electrons, but some use hydrogen gas at a pressure of 1 atmosphere.