A Uniform Circular Ring Has Charge Q and Radius R

question 43

Multiple Choice

A uniform circular ring has charge Q and radius r.The magnitude of the electric field at a distance of r along the axis of the ring is E_o.If the radius were to double,then calculate the new electric field at a distance of r along the axis of the ring in terms of E_o.

• A)0.40 E_o
• B)0.25 E_o
• C)0.50 E_o
• D)0.20 E_o
• E)0.089 E_o

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