AP Physics C: Electricity & Magnetism 10.2 A Describe the Movement of Charge and the Resulting Interactions When Conductors Physically Contact Each Other Questions

Practise predicting how charge moves when conductors touch by applying charge conservation, equal electric potential, conductor size, and contact-force effects.

Exam points

Conserve total charge and set connected conductors to equal potential to find each final charge.
Use V=kQ/R to determine how conductor radius sets the charge ratio at equilibrium.
Track charge polarity after contact with a plate to predict the resulting attraction or repulsion.

[Maximum number: 1]

Conducting spheres 1 and 2 on insulating stands have radii 2 R and R, respectively. The spheres are very far apart. Sphere 1 has an initial net charge +Q and Sphere 2 is initially neutral. The spheres are then connected by a conducting wire, as shown. The wire is then removed. Which of the following represents the value of the net charge on Sphere 1 after the wire is removed?

$\frac{1}{2} Q$

$\frac{2}{3} Q$

$\frac{3}{4} Q$

$\frac{4}{5} Q$

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AP Physics C: Electricity & Magnetism 10.2 A Describe the Movement of Charge and the Resulting Interactions When Conductors Physically Contact Each Other Questions question 1