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

एक क्षेत्र 'F' संरक्षित कहलायेगा यदि

1
∇.F̅ = 0
2
∇.∇F̅ = 0
3
∇ × F̅ = 0
4
उपरोक्त में से कोई नहीं
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