Consider the air moving over the top of the light bulb. the streamlines near the bulb will be squeezed together as the air goes over the top of the bulb. this leads to a region of on the top of the bulb.

low pressure

Explanation:

The streamlines of air particles are squeezed together as the air goes over the top of the bulb. Then, by the law of conservation of mass, the velocity of air particles are increased. And since, the velocity is increase the pressure is bound to decrease. Hence, this leads to region of low pressure on the top of the bulb.

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