Question
A wire is bent into a circular loop. If current is
passed through it, which one of the following statements is valid?Solution
In a conducting wire, current is driven by electric field , which points in the direction of current flow . Since the wire is bent into a loop, current must keep moving forward along the curved path. This means the electric field is tangential to the wire at each point to maintain the flow.
- (A) Electric field cannot be zero ; otherwise, current wouldn't flow.
- (B) If potential difference were same between any two points, current would not flow .
- (C) Electric field inside the conductor is tangential to the wire at all points, driving current around the loop.
- (D) A symmetric loop can sustain current ; symmetry doesn't prevent flow.
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