Question

Velocity-time (v-t) graph for a moving object is shown in the figure. Total displacement of the object during the time interval when there is non-zero acceleration and retardation is

• 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}}} $

Answer 1

Answer: (B)

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 $