WB JEE 2020 | Current Electricity Question 18 | Physics

WB JEE 2020

MCQ (Single Correct Answer)

-0.5

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?

$${\tan ^{ - 1}}\left( {{{eVL} \over {md{v_0}}}} \right)$$

$${\tan ^{ - 1}}\left( {{{eVL} \over {mdv_0^2}}} \right)$$

$${\sin ^{ - 1}}\left( {{{eVL} \over {md{v_0}}}} \right)$$

$${\cos ^{ - 1}}\left( {{{eVL} \over {mdv_0^2}}} \right)$$

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

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 28 English

WB JEE 2019 Physics - Current Electricity Question 28 English

$$15 \times {10^{ - 3}}C$$

$$12 \times {10^{ - 3}}C$$

$$10 \times {10^{ - 3}}C$$

$$3 \times {10^{ - 3}}C$$

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

What is the current I shown in the given circuit?

WB JEE 2019 Physics - Current Electricity Question 27 English

$${V \over {2R}}$$

$${V \over {R}}$$

$${V \over {16R}}$$

$${V \over {8R}}$$

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

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 26 English

WB JEE 2019 Physics - Current Electricity Question 26 English

2.5$$\Omega $$

3$$\Omega $$

5$$\Omega $$

7.5$$\Omega $$

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