A Disk with a Uniform Positive Surface Charge Density Lies

question 21

Multiple Choice

A disk with a uniform positive surface charge density lies in the x-y plane, centered on the origin.The disk contains 2.5 x 10^-6 C/m² of charge, and is 7.5 cm in radius.What is the electric field at z = 15 cm?

• A)30 N/C
• B)300 N/C
• C)3000 N/C
• D)3.0 x 10⁴ N/C
• E)3.0 x 10⁷ N/C

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