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複選題1. Newton's law of gravitation states that there exists an attractive force between the planet and the sun of masses m and M, respectively. The magnitude of the force is written as F = GmM /r2, where r is the distance of the planet from the sun, which is called the central force. The orbital motion of a particle under a central force is always (A)unbounded (B) bounded (C) confined to a plane (D) None of these.

2. Hook's law of spring states that if you stretch a spring from its equilibrium length by a displacement x, then the force F that the spring exerts on you is F = -c . Now a particle of mass m is executing oscillation obeying Hook's law. If the amplitude of oscillation is A, then its period is (A)proportional to (B) independent of A (C) proportional to 1/ (D) proportional to A2.

3. Experiments show that any liquid is incompressible. This implies that the density of a liquid (A) is a constant (B) varies at different parts of liquid (C) behaves like a gas (D) None of these.

4. When a charged particle (charge q and mass m) moves with velocity u through a region of space where both electric field E and magnetic induction field B are present. The charged particle would experience a force F. In vector form, the force is (A) F=qE+uxB (B) F=qExB (C) F=qu(E.B) (D) F=q(E+uxB) .

5. Two conducting plates have an area A and are separated by a distance d. The capacitance C of the parallel-plate capacitor is (A)(B)(C) (D) , where ε0, is the electric constant and μ0is the magnetic constant in a vacuum.

6.A very long ideal solenoid with a cross-section area A has N turns and a length l . Assume that each turn is circular. The self-inductance Ls of this ideal solenoid is NA (A) (B)(C) (D) , where ε0 is the electric constant and μ0 is the magnetic constant in a vacuum.

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