1
BITSAT 2024
MCQ (Single Correct Answer)
+3
-1
An oil drop of radius $ 1 \mu \mathrm{~m} $ is held stationary under a constant electric field of $ 3.65 \times 10^{4} \mathrm{~N} / \mathrm{C} $ due to some excess electrons presence on it. If the density of oil drop is $ 1.26 \mathrm{~g} / \mathrm{cm}^{3} $, then number of excess electrons on the oil drop approximately are [Take, $ g=10 \mathrm{~ms}^{-2} $ ]
A
7
B
12
C
9
D
8
2
BITSAT 2024
MCQ (Single Correct Answer)
+3
-1
The potential of a large liquid drop when eight liquid drops are combined is 20 V , then the potential of each single drop was
A
10 V
B
7.5 V
C
5 V
D
2.5 V
3
BITSAT 2024
MCQ (Single Correct Answer)
+3
-1
A dust particle of mass $ 4 \times 10^{-12} \mathrm{mg} $ in suspended in air under the influence of an electric field of $ 50 \mathrm{~N} / \mathrm{C} $ directed vertically upwards. How many electrons were removed from the neutral dust particle? [Take, $ g=10 \mathrm{~m} / \mathrm{s} $ $ { }^{2} $ ]
A
15
B
8
C
5
D
4
4
BITSAT 2024
MCQ (Single Correct Answer)
+3
-1
Electric field at point $ (30,30,0) $ due to a charge of $ 0.008 \mu \mathrm{C} $ placed at origin will be, (coordinates are in cm )
A
$ 8000 \mathrm{NC}^{-1} $
B
$ 4000(\hat{\mathbf{i}}+\hat{\mathbf{j}}) \mathrm{NC}^{-1} $
C
$ 200 \sqrt{2}(\hat{\mathbf{i}}+\hat{\mathbf{j}}) \mathrm{NC}^{-1} $
D
$ 400 \sqrt{2}(\hat{\mathbf{i}}+\hat{\mathbf{j}}) \mathrm{NC}^{-1} $
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