1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

3 point charges each of $$-\mathrm{q}$$ are placed on the circumference of a circle of diameter $$2 \mathrm{a}$$ at $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ respectively as shown in figure. The electric field at $$\mathrm{O}$$ is

COMEDK 2024 Afternoon Shift Physics - Electrostatics Question 18 English

A
Zero
B
$$\frac{\mathrm{Kq}}{2 \mathrm{a}}$$ towards $$\mathrm{OC}$$
C
$$\frac{\mathrm{Kq}}{\mathrm{a}}$$ towards $$\mathrm{OB}$$
D
$$\frac{\mathrm{Kq}}{\mathrm{a}}$$ towards $$\mathrm{OA}$$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A uniformly charged solid sphere of radius $$\mathrm{R}$$ has potential $$\mathrm{V}_0$$ (measured with respect to infinity) on its surface. For this sphere the equipotential surfaces with potentials $$\frac{3 \mathrm{~V}_0}{2}, \frac{\mathrm{V}_0}{1}, \frac{3 \mathrm{~V}_0}{4}$$ and $$\frac{\mathrm{V}_0}{4}$$ have radius $$\mathrm{R}_1, \mathrm{R}_2, \mathrm{R}_3$$ and $$\mathrm{R}_4$$ and respectively, then

A
$$ R_1 \neq 0 \text { and }\left(R_2-R_1\right)>\left(R_4-R_3\right) $$
B
$$ R _2< R_4 $$
C
$$ R_1=0 \text { and } R_2>\left(R_4-R_3\right) $$
D
$$ R_1=0 \text { and } R_2<\left(R_4-R_3\right) $$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A square shaped aluminium coin weighs $$0.75 \mathrm{~g}$$ and its diagonal measures $$14 \mathrm{~mm}$$. It has equal amounts of positive and negative charges. Suppose those equal charges were concentrated in two charges $$(+Q$$ and $$-Q)$$ that are separated by a distance equal to the side of the coin, the dipole moment of the dipole is

A
$$34.8 \mathrm{~Cm}$$
B
$$3.48 \mathrm{~Cm}$$
C
$$3480 \mathrm{~Cm}$$
D
$$348 \mathrm{~Cm}$$
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If potential (in volt) in a region is expressed as $$\mathrm{V}(\mathrm{x}, \mathrm{y}, \mathrm{z})=6 \mathrm{xy}-\mathrm{y}+2 \mathrm{yz}$$, the electric field (in $$N C^{-1}$$) at point $$(1,0,1)$$ is

A
$$\mathrm{-7 j}$$
B
$$+7 \mathrm{j}$$
C
$$\mathrm{-6 i+7 j}$$
D
$$\mathrm{6 i-7 j}$$
COMEDK Subjects
EXAM MAP