1
NEET 2018
+4
-1
A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n?
A
B
C
D
2
NEET 2018
+4
-1
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
3
NEET 2017
+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 2017
+4
-1
A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves
A
B
a condition of no current flow through the galvanometer
C
a combination of cells, galvanometer and resistances
D
cells
EXAM MAP
Medical
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