Teaching DSSSB PGT Mock Test 2025 Engineering Mathematics Calculus Vector Calculus

यदि \(\vec r = x\hat i + y\hat j + z\hat k\) और \(\left| {\vec r} \right| = r\) है तो \({r^n}\vec r\) किसके लिए सोलनॉइडल है?

1
n = - 3
2
n = 1
3
n के सभी मानों के लिए 
4
\({r^n}\vec r\) घूर्णी है
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