Answer this qn .........
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Answer:
b
Explanation:
in such situation, equivalent g is necessary. now in normal situation means having only g as acceleration, g works as external force, which is vertically downwards, to oscillate the pandulam.
in the given case, the electrical field facing upwards effects the ocsillation of the pandulam as it has q charge placed up on because the electrical force QE has it own acceleration upwards. so, the equivalent acceleration decreases which can be proven by method as shown below.
The upward electrical force F.e = QE
and F.e can be taken as MA as well, therefore where M is mass and A is acceleration created by the electrical force.
MA = QE
A = QE/M
therefore, equivalent acceleration = g-QE/M
SO, the answer is B
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