EASY
JEE Main/Advance
IMPORTANT
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If a copper wire is stretched to make its radius decrease by the percentage change in its resistance is approximately.
(a)
(b)
(c)
(d)

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Important Questions on Current Electricity
MEDIUM
JEE Main/Advance
IMPORTANT

EASY
JEE Main/Advance
IMPORTANT

EASY
JEE Main/Advance
IMPORTANT
A cell of emf having an internal resistance is connected to an external resistance . The potential difference across the resistance varies with as shown in figure by the curve :

EASY
JEE Main/Advance
IMPORTANT
In a circuit shown in figure resistances and are known, as well as emf’s and . The internal resistances of the sources are negligible. At what value of the resistance will the thermal power generated in it be the highest ?

MEDIUM
JEE Main/Advance
IMPORTANT

HARD
JEE Main/Advance
IMPORTANT
The equivalent resistance between and will be (in )

MEDIUM
JEE Main/Advance
IMPORTANT
A wire is in the form of a tetrahedron. The resistance of each edge is The equivalent resistances between corners and are respectively-

MEDIUM
JEE Main/Advance
IMPORTANT
The equivalent resistance between points and is:
