A) If \[0<n<1\], \[e\ne 0\] and \[\left. \left| e \right. \right|\]decreases with time
B) If n=1, e is constant
C) If n > 1, \[\left| e \right|\]increases with time
D) If n>l, \[\left| e \right|\] decreases with time
Correct Answer: D
Solution :
[d] \[\phi =4{{t}^{n}}+6\] \[\frac{d\phi }{dt}=4n{{t}^{n-1}}\] \[\left| {\vec{e}} \right|=4n{{t}^{n-1}}\], \[\left| \left. e \right| \right.=\frac{4n}{{{t}^{1-n}}}\]
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