Answer:


ANGLE is 35.3 degree celcius
Explanation:
Given data:
mass m and 3m
initial speed Vi
particle with mass m is moving toward left while particle with mass 3m is moving toward right
By using conservation of momentum :



conservation of energy :



After collision, particle with mass m moves at right angles, thus by considering conservation of momentum in x & y direction,
x direction : 

y direction : 

subsitute these value in energy conservation


35.3 degree from x-axis
Answer:
The magnetic field in the region a < r < b is 
Explanation:
If we have the a < r < b. The formula of current is:

Where:
A = area enclosed by the loop.
Itotal = total current in loop.



If we have the Ampere`s law:

Answer:

Explanation:
As we know that work done by electric force is given as

so here we know that charge is moving from

to another position
so we will have




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