railway RRB JE (CBT I + CBT II) Mock Test 2024 Electromagnetic Theory Vector Calculus

बिंदु P(0, 4, 0) के लिए इनमें से कौन-सा सही नहीं है?

1
aϕ = -ax
2
aθ = -az
3
ar = 4ay
4
aρ = aγ
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