1
JEE Main 2018 (Offline)
+4
-1
Out of Syllabus
In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52 cm of the potentiometer wire. If the cell is shunted by a resistance of 5 $$\Omega$$, a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell.
A
2.5 $$\Omega$$
B
1 $$\Omega$$
C
1.5 $$\Omega$$
D
2 $$\Omega$$
2
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is $$\rho$$, how long will the changes take to travel a distance d ?
A
$${{2\rho \,d\,A} \over {\rm I}}$$
B
$${{2\rho \,d\,A} \over {{\rm I}\,T}}$$
C
$${{\rho \,d\,A} \over {{\rm I}\,}}$$
D
$${{\rho \,d\,A} \over {{\rm I}\,T}}$$
3
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
A constant voltages is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be :
A
Doubled
B
Halved
C
Unchanged
D
Increased 8 times
4
JEE Main 2018 (Online) 15th April Morning Slot
+4
-1

In a meter bridge, as shown in the figure, it is given that resistance $$Y = 12.5\,\,\Omega$$ and that the balance is obtained at a distance $$39.5$$ $$cm$$ from end $$A$$ (by Jockey J). After interchanging the resistances $$X$$ and $$Y$$, a new balance point is found at a distance $${l_2}$$ from end $$A.$$ What are the value of $$X$$ and $${l_2}$$ ?
A
$$8.16\,\,\Omega$$ and $$60.5$$ $$cm$$
B
$$19.15\,\,\Omega$$ and $$39.5$$ $$cm$$
C
$$8.16\,\,\Omega$$ and $$39.5$$ $$cm$$
D
$$19.15\,\,\Omega$$ and $$60.5$$ $$cm$$
EXAM MAP
Medical
NEET