Question

In case D, if the oil drop diagram shows the motion of a left-ward-moving object, Which

force diagram(s) is/are consistent with the oil drop diagram? (The arrows represent

forces; arrow length represents the size of the force.)

(a) A only

(b) B only

(c) B and C

(d) D and E​

Answer 1

(c) B and C

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Answer 2

Force diagram A only is consistent with the oil drop diagram. (option a)

Let us analyze each force diagram.

A

• In A three forces are shown:

1. 2 equal forces upwards and downwards
2. 1 force acting left

• The upwards and downwards forces are equal and opposite in magnitude and direction. Hence, they will cancel each other out.
• Thus, the effective force acting on the object will be towards the left only.
• So this option is consistent with the oil drop diagram.

B

• Similar to case A, in B the upward and downward forces cancel each other out.
• However, in this case, the force acting towards the right is opposite in direction and greater in magnitude than the force acting towards the left.
• So the effective force will be towards the right and the object will move right.
• So this option is not consistent with the oil drop diagram.

C

• In this case, the upward and downward forces get canceled.
• Thus the effective force is towards the right.
• So this option is wrong.

D

• In this case, the opposite and equal forces get canceled out.
• So, this object will be in equilibrium, as the effective force is 0.
• Hence, this option is wrong.

E

• In this case, all forces will cancel each other out and the object will be in equilibrium.
• It will not show movement in any direction.
• Hence, this option is wrong.

Therefore, the correct option is (a) A only.