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← IIT-JEE 2009 · Paper 2
PhysicsMultiple correct+4 / -1Question 46 of 57

IIT-JEE 2009 · Paper 2, Physics question 46

Under the influence of the Coulomb field of charge +Q+Q, a charge −q-q is moving around it in an elliptical orbit. Find out the correct statement(s).

Choose one or more options
Answer and worked solution

Official answer: A

Central force. The Coulomb attraction always points to +Q+Q, so its torque about +Q+Q is zero and the angular momentum of −q-q is conserved.

In an elliptical orbit the speed, the momentum (direction and size) and the angular velocity all vary with distance.

(A)

Topics:Coulomb's law and superpositionKepler's lawsAngular momentum and its conservation
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