In the figure,a ring 0.71 m in radius carries a charge of + 580 nC uniformly distributed over it.A point charge Q is placed at the center of the ring.The electric field is equal to zero at field point P,which is on the axis of the ring,and 0.73 m from its center. 
The point charge Q is closest to 
Definitions:
Price of Capital
The cost of using capital goods in production, which can include interest payments on loans or rent on equipment.
Marginal Product
The additional output gained by adding one more unit of a specific input, keeping all other inputs constant.
Economic Profit
The profit from an activity or business venture after subtracting both explicit and implicit costs, including opportunity costs.
Rate of Return
The gain or loss of an investment over a specified period, expressed as a percentage of the investment's cost.
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