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
A
10
B
11
C
20
D
9
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves
A
potential gradients
B
a condition of no current flow through the galvanometer
C
a combination of cells, galvanometer and resistances
D
cells
3
NEET 2017
MCQ (Single Correct Answer)
+4
-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
A
$${R \over n}$$
B
n2R
C
$${R \over {{n^2}}}$$
D
nR
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
The potential difference (VA $$-$$ VB) between the points A and B in the given figure is
