NEET 2017 | Current Electricity Question 42 | Physics

NEET 2017

MCQ (Single Correct Answer)

-1

The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length. its new resistance will be

$${R \over n}$$

n²R

$${R \over {{n^2}}}$$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is

230 $$\Omega $$

46 $$\Omega $$

26 $$\Omega $$

13 $$\Omega $$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

The potential difference (V_A $$-$$ V_B) between the points A and B in the given figure is

NEET 2016 Phase 2 Physics - Current Electricity Question 108 English

$$-$$ 3V

+3 V

+6 V

+9 V

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

The charge flowing through a resistance R varies with time t is Q = at $$-$$ bt², where $$a$$ and $$b$$ are positive constants. The total heat produced in R is

$${{{a^3}R} \over {2b}}$$

$${{{a^3}R} \over {b}}$$

$${{{a^3}R} \over {6b}}$$

$${{{a^3}R} \over {3b}}$$

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