WB JEE 2021 | Current Electricity Question 10 | Physics

Two metal wires of identical dimensions are connected in series. If $$\sigma$$₁ and $$\sigma$$₂ are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

$$\sigma$$₁ + $$\sigma$$₂

$${{{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$

$${{2{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$

$${{{\sigma _1} + {\sigma _2}} \over {2{\sigma _1}{\sigma _2}}}$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

A galvanometer can be converted to a voltmeter of full scale deflection V₀ by connecting a series resistance R₁ and can be converted to an ammeter of full scale deflection I₀ by connecting a shunt resistance R₂. What is the current flowing through the galvanometer at its full scale deflection?

$${{{V_0} - {I_0}{R_2}} \over {{R_1} - {R_2}}}$$

$${{{V_0} + {I_0}{R_2}} \over {{R_1} + {R_2}}}$$

$${{{V_0} - {I_0}{R_1}} \over {{R_2} - {R_1}}}$$

$${{{V_0} + {I_0}{R_1}} \over {{R_1} + {R_2}}}$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

WB JEE 2020 Physics - Current Electricity Question 27 English

What will be the equivalent resistance between the terminals A and B of the infinite resistive network shown in the figure?

$${{\left( {\sqrt 3 + 1} \right)R} \over 2}$$

$${{\left( {\sqrt 3 - 1} \right)R} \over 2}$$

$$3{R \over 2}$$

$${\left( {\sqrt 3 + 1} \right)R}$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

Consider the circuit shown.

WB JEE 2020 Physics - Current Electricity Question 28 English

If all the cells have negligible internal resistance, what will be the current through the 2$$\Omega $$ resistor when steady state is reached?

0.66 A

0.29 A

0 A

0.14 A

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