Electricity and Magnetism Practice Questions | University Admission Physics

University Admission Physics Exam

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A neutral metal sphere is mounted on an insulating stand. A positively charged rod is brought near (without touching) the sphere. While the rod is still near, the sphere is briefly connected to Earth, then the Earth connection is removed, and finally the rod is taken far away. What is the final charge on the sphere?

Select one option.

Zero, because induction only polarizes charge temporarily
Positive, because protons flowed from Earth onto the sphere
Zero, because no contact occurred with the rod
Positive, because electrons were repelled from the sphere
Negative, because electrons flowed from Earth onto the sphere

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