1
WB JEE 2020
MCQ (Single Correct Answer)
+2
-0.5
Change Language
A pair of parallel metal plates are kept with a separation d. One plate is at a potential + V and the other is at ground potential. A narrow beam of electrons enters the space between the plates with a velocity v0 and in a direction parallel to the plates. What will be the angle of the beam with the plates after it travels an axial distance L?
A
$${\tan ^{ - 1}}\left( {{{eVL} \over {md{v_0}}}} \right)$$
B
$${\tan ^{ - 1}}\left( {{{eVL} \over {mdv_0^2}}} \right)$$
C
$${\sin ^{ - 1}}\left( {{{eVL} \over {md{v_0}}}} \right)$$
D
$${\cos ^{ - 1}}\left( {{{eVL} \over {mdv_0^2}}} \right)$$
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Five identical capacitors, of capacitance 20$$\mu$$F each, are connected to a battery of 150V, in a combination as shown in the diagram. What is the total amount of charge stored?

WB JEE 2019 Physics - Current Electricity Question 29 English
A
$$15 \times {10^{ - 3}}C$$
B
$$12 \times {10^{ - 3}}C$$
C
$$10 \times {10^{ - 3}}C$$
D
$$3 \times {10^{ - 3}}C$$
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
What is the current I shown in the given circuit?

WB JEE 2019 Physics - Current Electricity Question 28 English
A
$${V \over {2R}}$$
B
$${V \over {R}}$$
C
$${V \over {16R}}$$
D
$${V \over {8R}}$$
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
When the value of R in the balanced Wheatstone bridge, shown in the figure, is increased from 5$$\Omega $$ to 7$$\Omega $$, the value of S has to be increased by 3$$\Omega $$ in order to maintain the balance. What is the initial values of S?

WB JEE 2019 Physics - Current Electricity Question 27 English
A
2.5$$\Omega $$
B
3$$\Omega $$
C
5$$\Omega $$
D
7.5$$\Omega $$
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