The diagram shown represents a portion of a wire in a circuit.A current is flowing in the wire in the direction shown.Under the convention that it is positive charge that flows the electric field points in the direction of the current.How can the electric field change direction where the wire bends?
A)There is an excess of negative charge in the centre of the wire.
B)There is an excess of positive charge at the bottom end of the wire.
C)There is an excess of negative charge at the right end of the upper portion of the wire.
D)There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field.
E)There is an accumulation of electrical potential as the current traverses the wire.The higher potential in the lower half is the source of the field.

Question

The diagram shown represents a portion of a wire in a circuit.A current is flowing in the wire in the direction shown.Under the convention that it is positive charge that flows the electric field points in the direction of the current.How can the electric field change direction where the wire bends? 
A)There is an excess of negative charge in the centre of the wire. 
B)There is an excess of positive charge at the bottom end of the wire. 
C)There is an excess of negative charge at the right end of the upper portion of the wire. 
D)There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field. 
E)There is an accumulation of electrical potential as the current traverses the wire.The higher potential in the lower half is the source of the field.

Quizplus · Accepted Answer

When a wire bends, the charge carriers experience a change in direction, causing them to accumulate more toward one side of the wire. This leads to a buildup of charge on the surface, particularly at the bend, creating an electric field that points in a direction different from the original field. The sum of the original and new fields gives the resulting electric field at the bend. Therefore, the best choice is option D, which describes the accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field.

The Diagram Shown Represents a Portion of a Wire in a Circuit.A