Electrostatics — Grade 11 Past Paper Questions

Two identical conducting spheres with charges Q and –2Q; after contact and separation at distance r, determine the electrostatic force magnitude.

Three charged spheres are arranged with S placed 10 cm right of R. Given the net force on P is 6.6 N rightward, calculate the electrostatic force that S exerts on P and determine S's charge.

Three rubber-mounted charged spheres (−4 nC, +7 nC, +10 nC) at 5 cm and 12 cm spacing. State Coulomb's law, calculate net force on C, and determine electrons transferred when A and B touch.

Sphere A (−0.65 μC) is 10 cm from sphere B (+0.8 μC). Define electric field, draw field lines for A, and calculate net field magnitude at point P located 7 cm right of A.

Two identical positively charged spheres suspended from a ceiling by threads. Draw force triangle, calculate electrostatic force on sphere A (mass 1.5 g), and find electric field at A due to B.

Two charged particles (R: 3×10⁻⁶ C and S: −5×10⁻⁶ C) are 0.4 m apart. Calculate electrostatic forces and electric fields at various points; determine force on an electron placed in the field.

Multiple-choice on gravitational acceleration on hypothetical planets with specified mass and radius ratios compared to Earth, and electric field relationship versus distance squared from charged sphere.

A 20 000 kg rocket launches vertically and loses 5 000 kg of fuel as it climbs — calculate its weight at Earth's surface and the percentage drop at altitude. The page then moves to electric fields.

Multiple-choice questions on gravitational and electrostatic forces: how force changes when mass and distance change, and how doubling charges affects electrostatic force.

Ends a multiple-choice page with a question on the ratio and sign of two charges separated by 5d. The next question begins: a heavy object lifted by two ropes at 530 N and 1 240 N over a pair of pulleys.

Multiple-choice questions covering gravitational attraction between masses at varying distances and electrostatic force relationships when separation distance changes.

Jupiter has 300 times Earth's mass and 11 times its radius — state Newton's law of universal gravitation and find the weight of a 120 kg astronaut on its surface. The next question begins, on two charged spheres brought into contact.

Multiple-choice page covering electrostatics and electromagnetism: draw electric field for +6 nC charge, state Coulomb's law, calculate force between ±charged spheres, find distance to point of zero field.

Multiple-choice: when two charged objects' separation halves, how does the repulsive force change; compare bulb brightness in series circuit based on resistances.

Multiple-choice on factors affecting gravitational force between masses at various distances and separations, and determining direction of net electric force from paired charges.