WB JEE 2017 | Current Electricity Question 25 | Physics

Consider the circuit shown in the figure where all the resistances are of magnitude 1 k$$\Omega$$. If the current in the extreme right resistance X is 1 mA, the potential difference between A and B is

34 V

21 V

68 V

55 V

WB JEE 2017

MCQ (Single Correct Answer)

-0.5

Consider the circuit given here. The potential difference V_BC between the points B and C is

WB JEE 2017 Physics - Current Electricity Question 14 English

WB JEE 2017 Physics - Current Electricity Question 14 English

1 V

0.5 V

0 V

$$-$$ 1 V

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$$\Omega$$

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