1
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If pressure of real gas O2, in a container is given by $$p = {{RT} \over {2V - b}} - {a \over {4{b^2}}}$$, then the mass of the gas in the container is
A
32 g
B
16 g
C
4 g
D
64 g
2
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
300 g of water at 25$$^\circ$$C is added to 100 g of ice at 0$$^\circ$$C. The final temperature of the mixture is
A
12.5$$^\circ$$C
B
0$$^\circ$$C
C
25$$^\circ$$C
D
50$$^\circ$$C
3
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
WB JEE 2021 Physics - Electrostatics Question 12 English
The variation of electric field along the Z-axis due to a uniformly charged circular ring of radius a in XY-plane as shown in the figure. The value of coordinate M will be
A
$${1 \over 2}$$
B
$$\sqrt 2 $$
C
1
D
$${1 \over {\sqrt 2 }}$$
4
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A metal sphere of radius R carrying charge q is surrounded by a thick concentric metal shell of inner and outer radii a and b, respectively. The net charge on the shell is zero. The potential at the centre of the sphere, when the outer surface of the shell is grounded will be
A
$${q \over {4\pi {\varepsilon _0}}}\left( {{1 \over a} - {1 \over b}} \right)$$
B
$${q \over {4\pi {\varepsilon _0}}} - {1 \over a}$$
C
$${q \over {4\pi {\varepsilon _0}}}\left( {{1 \over R} - {1 \over a}} \right)$$
D
$${q \over {4\pi {\varepsilon _0}}} - {1 \over R}$$
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