WB JEE 2016 | Current Electricity Question 27 | Physics

WB JEE 2016

MCQ (Single Correct Answer)

-0.25

Two wires of same radius having lengths l₁ and l₂ and resistivities $${{\rho _1}}$$ and $${{\rho _2}}$$ are connected in series. The equivalent resistivity will be

$${{{\rho _1}{l_2} + {\rho _2}{l_1}} \over {{\rho _1} + {\rho _2}}}$$

$${{{\rho _1}{l_1} + {\rho _2}{l_2}} \over {{l_1} + {l_2}}}$$

$${{{\rho _1}{l_1} - {\rho _2}{l_2}} \over {{l_1} - {l_2}}}$$

$${{{\rho _1}{l_2} + {\rho _2}{l_1}} \over {{l_1} + {l_2}}}$$

WB JEE 2016

MCQ (Single Correct Answer)

-0.25

Two equal resistances, 400 $$\Omega$$ each, are connected in series with a 8 V battery. If the resistance of first one increases by 0.5%, the change required in the resistance of the second one in order to keep the potential difference across it unaltered is to

increase it by 1$$\Omega$$

increase it by 2$$\Omega$$

increase it by 4$$\Omega$$

decrease it by 4$$\Omega$$

WB JEE 2016

MCQ (Single Correct Answer)

-0.5

The effective resistance between A and B in the figure is $${7 \over {12}}\Omega $$ if each side of the cube has 1$$\Omega$$ resistance. The effective resistance between the same two points, when the link AB is removed, is

WB JEE 2016 Physics - Current Electricity Question 21 English

WB JEE 2016 Physics - Current Electricity Question 21 English

$${7 \over {12}}\Omega $$

$${5 \over {12}}\Omega $$

$${7 \over {5}}\Omega $$

$${5 \over {7}}\Omega $$

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