Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Calculus Vector Calculus

\(\rm ​\oint_c \vec{r} . d \vec{r}=\) _______. 

1
0
2
\(\rm \iint_s \vec{n} \ {ds}\)
3
\(\rm\frac{1}{2} \iint_s \vec{n} \ {ds}\)
4
\(\rm 2 \iint_s \vec{n}\ {ds}\)
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