Answer:
Explanation:
Given
First charge of
is placed at 
Second charge
is placed at 
Electric field is given by

Electric field due to
is away from it


Electric field due to


Net electric field will be vector addition of two


Magnitude of Electric field is


Answer:
a) 
b) 
Explanation:
Given:
- mass of copper,

- initial temperature of copper,

- specific heat capacity of copper,

- mass of water,

- initial temperature of water,

- specific heat capacity of water,

a)
<u>∵No heat is lost in the environment and the heat is transferred only between the two bodies:</u>
Heat rejected by the copper = heat absorbed by the water


b)
<u>Now the amount of heat transfer:</u>



∴Entropy change



If the wavelength increases (gets longer), then the frequency <em>decreases</em>.
(A wave occurs less often.)
The correct answer is B. Electrons flow because of electrical attraction and repulsion.