A) \[40m\]
B) \[\frac{qQ}{4\pi {{\varepsilon }_{0}}r}\]
C) \[\frac{qQ}{4\pi \varepsilon _{0}^{2}{{r}^{2}}}\]
D) \[\frac{qQ}{4\pi {{\varepsilon }_{0}}{{r}^{2}}}\]
Correct Answer: B
Solution :
Between time interval 20 s to 40 s, there is non-zero, acceleration and retardation. Hence, distance . travelled during this interval = Area between time interval 20 s to 40 s \[\lambda \,\,\,\,\pi {{r}^{3}}\frac{dB}{dt}\] \[1A\]
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