JEE Main 2021 — Electrostatics Question with Solution
From: JEE Main 2021 (Online) 26th February Evening Shift
Question
An inclined plane making an angle of 30 with the horizontal is placed in a uniform horizontal electric field as shown in the figure. A body of mass 1 kg and charge 5 mC is allowed to slide down from rest at a height of 1 m. If the coefficient of friction is 0.2, find the time taken by the body to reach the bottom.
[g = 9.8 m/s2; ; ]
[g = 9.8 m/s2; ; ]
This question includes a diagram. The text above accompanies the figure.
Choose an option
Show full solutionCorrect option: C
Correct answer
C1.3 s
Step-by-step explanation
f = mg sin (N + qE cos)
F = mg sin (mg cos + qE sin) qE cos
F = 1 10 sin30
0.2 (1 10 cos30 + 200 5 103 sin30)
200 5 103 cos30
F = 2.3 N
m/sec2
sec
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