1
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

4 point charges each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is

A
0
B
$${{4q} \over d}$$
C
$${{4d} \over q}$$
D
$${q \over {4d}}$$
2
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

64 identical spheres of charge q and capacitance C each are combined to form a large sphere. The charge and capacitance of the large sphere is

A
64q, C
B
16q, 4C
C
64q, 4C
D
16q, 64C
3
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25

Consider a particle of mass 1 gm and charge 1.0 Coulomb is at rest. Now the particle is subjected to an electric field $E(t)=E_0 \sin \omega t$ in the $x$-direction, where $E_0=2$ Newton/Coulomb and $\omega=1000 \mathrm{rad} / \mathrm{sec}$. The maximum speed attained by the particle is

A
$2 \mathrm{~m} / \mathrm{sec}$
B
$4 \mathrm{~m} / \mathrm{sec}$
C
$6 \mathrm{~m} / \mathrm{sec}$
D
$8 \mathrm{~m} / \mathrm{sec}$
4
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25

Two charges $+q$ and $-q$ are placed at points $A$ and $B$ respectively which are at a distance $2 L_{\mathrm{p} p a t}$ $C$ is the mid point of $A$ and $B$. The workdone in moving a charge $+Q$ along the semicircle $\operatorname{CSD}\left(W_V\right)$ and along the line $\mathrm{CBD}\left(W_2\right)$ are

WB JEE 2025 Physics - Electrostatics Question 1 English

A
$\frac{q Q}{4 \pi \epsilon_0 L}, \frac{q Q}{4 \pi \epsilon_0 L}$
B
$\frac{-Q q}{6 \pi \epsilon_0 L}, \frac{-Q q}{6 \pi \epsilon_0 L}$
C
$\frac{-Q q}{6 \pi \epsilon_0 L}, \frac{-Q q}{12 \pi \epsilon_0 L}$
D
$\frac{q Q}{4 \pi \epsilon_0 L}, 0$
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