Explanation:
hope this would be the right answer ..
 
        
             
        
        
        
Answer
The rate at which the magnetic field is changing is  ![[\frac{dB}{dt} ] =  0.000467 T/s](https://tex.z-dn.net/?f=%5B%5Cfrac%7BdB%7D%7Bdt%7D%20%5D%20%3D%20%200.000467%20T%2Fs) 
 
Explanation 
From the question we are told that 
    The electric field strength is 
     The radius is  
The rate of change of the  magnetic  field  is mathematically represented as 
         
Where  is change of a unit length
 is change of a unit length 
      
Where A is the area which is mathematically represented as
      
     So 
      
  
    
  
where L is the circumference of the circle which is mathematically represented as
      
So 
      ![E (2 \pi r ) =  (\pi r^2 ) [\frac{dB}{dt} ]](https://tex.z-dn.net/?f=E%20%282%20%5Cpi%20r%20%29%20%3D%20%20%28%5Cpi%20r%5E2%20%29%20%5B%5Cfrac%7BdB%7D%7Bdt%7D%20%5D)
       ![E  =   \frac{r}{2}  [\frac{dB}{dt} ]](https://tex.z-dn.net/?f=E%20%20%3D%20%20%20%5Cfrac%7Br%7D%7B2%7D%20%20%5B%5Cfrac%7BdB%7D%7Bdt%7D%20%5D)
        ![[\frac{dB}{dt} ] = \frac{E}{ \frac{r}{2} }](https://tex.z-dn.net/?f=%5B%5Cfrac%7BdB%7D%7Bdt%7D%20%5D%20%3D%20%5Cfrac%7BE%7D%7B%20%5Cfrac%7Br%7D%7B2%7D%20%7D)
substituting values 
       ![[\frac{dB}{dt} ] = \frac{3.5 *10^{-3}}{ \frac{15}{2} }](https://tex.z-dn.net/?f=%5B%5Cfrac%7BdB%7D%7Bdt%7D%20%5D%20%3D%20%5Cfrac%7B3.5%20%2A10%5E%7B-3%7D%7D%7B%20%5Cfrac%7B15%7D%7B2%7D%20%7D)
       ![[\frac{dB}{dt} ] =  0.000467 T/s](https://tex.z-dn.net/?f=%5B%5Cfrac%7BdB%7D%7Bdt%7D%20%5D%20%3D%20%200.000467%20T%2Fs) 
     
 
        
             
        
        
        
Answer:
<h2>Mass of 1 Kg and 2 Kg, 1 meters apart.</h2>
Explanation:
The gravitational force is defined as

By definition, the gravitational force depends directly on the product of the masses and indirectly on the distance between the masses, which means the further they are, the less gravitational force would be. And, the greater the masses, the greater the gravitational force.
Among the options, the pair that would have the greatest gravitational force is  Mass of 1 Kg and 2 Kg, with 1 meter between them.
Notice that the last choice includes the same masses but with a greater distance between them, that means it would be a weaker graviational force.
Therefore, the right answer is the second choice.
 
        
             
        
        
        
Answer:
2 J
Explanation:
A charged capacitor of capacitance  with energy of 7.54 J, is connected in parallel with another capacitor
 with energy of 7.54 J, is connected in parallel with another capacitor  , so the charge is equally distributed between them.
 , so the charge is equally distributed between them.
(a) The energy stored in the capacitor before it being connected to the other capacitor is:

The energy stored in the electric field is the sum of the energies of the two capacitors:

since the charge equally distributed,   =
 =  =
 =  . and since they are connected in parallel the potential difference on both of them is the same
:
. and since they are connected in parallel the potential difference on both of them is the same
:

hence,

 
        
             
        
        
        
Answer:
6 V
Explanation:
We can solve the problem by using Ohm's law:

where
V is the voltage in the circuit
R is the resistance
I is the current
In this problem, we know the current,  , and the resistance,
, and the resistance,  , therefore we can find the voltage in the circuit:
, therefore we can find the voltage in the circuit:
