Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Calculus Vector Calculus

If \(\bar r = x\hat i + y\hat j + z\hat k\) and r = |r̅|, then ∇2 [log r] = ?

1
0
2
\(\frac{{ - 1}}{{{r^2}}}\)
3
\(\frac{1}{{{r^2}}}\)
4
\(\frac{{ - 2}}{{{r^2}}}\)
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