NEET 2018 | Current Electricity Question 40 | Physics

A set of n equal resistors, of value R each, are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the n resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10I. The value of n is

NEET 2017

MCQ (Single Correct Answer)

-1

A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves

potential gradients

a condition of no current flow through the galvanometer

a combination of cells, galvanometer and resistances

cells

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 $$\Omega $$

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