Question

if r vector cross dr vector is equal to 0, show that r cap is equal to constant​

Answer 1

Answer:

r.dr=0

Then,

\begin{gathered} = > 2r.dr = 0 \\ = > r.dr + dr.r = 0 \\ = > d(r.r) = 0 \\ = > { |r| }^{2} = constant \: \\ = > r \: = constant \: \end{gathered}

=>2r.dr=0

=>r.dr+dr.r=0

=>d(r.r)=0

=>∣r∣

2

=constant

=>r=constant

Hence Proved

Step-by-step explanation:

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