Answer:
0.647 nC
Explanation:
The force experienced by a charge due to the presence of an electric field is given by

where
q is the charge
E is the magnitude of the electric field
In this problem, each antenna is modelled as it was a single point charge, experiencing a force of

Therefore, if the electric field magnitude is

Then the charge on each antenna would be

As the stan moves 0.94 s before with an acceleration 4.12 m/s^2
so the distance moved by it
![d = \frac{1}{2}at^2[tex]d = \frac{1}{2}*4.12*0.94^2](https://tex.z-dn.net/?f=d%20%3D%20%5Cfrac%7B1%7D%7B2%7Dat%5E2%3C%2Fp%3E%3Cp%3E%5Btex%5Dd%20%3D%20%5Cfrac%7B1%7D%7B2%7D%2A4.12%2A0.94%5E2)

speed gained by the car is given as


now the relative speed of them is given as

relative acceleration is given as

now the distance between them is to be covered


by solving above equation we have

so it will overtake after 6.64 s
Well, half-life is the radioactivity of an identified isotope that decreases by half of the actual value.
So, your answer would be C.
Don’t still need the answers or are u done and is it on edge