Answer:
The electric field due to charge at distance r is
Explanation:
Given that,
Initial position of particle
Final position of particle
We need to calculate the magnitude of the position vector
Using formula of position vector
Put the value into the formula
We need to calculate the unit vector along electric field direction
Using formula of unit vector
Put the value into the formula
We need to calculate the electric field due to charge at distance r
Using formula of electric field
Put the value into the formula
Hence, The electric field due to charge at distance r is
Answer: B superconductors
Explanation:
KE=1/2 mv^2
=1/2(150kg)(15m/s)^2
=16875 kgms^-2