1
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
In the experimental set up of metre bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 $$\Omega$$ resistor is connected in series with R1, the null point shifts by 10 cm. The resistance that should be connected in parallel with (R1 + 10) $$\Omega$$ such that the null point shifts back to its initial position is : A
40 $$\Omega$$
B
30 $$\Omega$$
C
20 $$\Omega$$
D
60 $$\Omega$$
2
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :
A
240 W
B
60 W
C
30 W
D
120 W
3
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
The resistance of the meter bridge AB in given figure is 4 $$\Omega$$. With a cell of emf $$\varepsilon$$ = 0.5 V and rheostat resistance Rh = 2 $$\Omega$$ the null point is obtained at some point J. When the cell is replaced by another one of emf $$\varepsilon$$ = $$\varepsilon$$2 the same null point J is found for Rh = 6 $$\Omega$$. The emf $$\varepsilon$$2 is, : A
0.3 V
B
0.6 V
C
0.5 V
D
0.4 V
4
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
In a Wheatstone bridge(see fig.), Resistances P and Q are approximately equal. When R = 400 $$\Omega$$, the bridge is balanced. On interchanging P and Q, the value of R, for balance, is 405 $$\Omega$$. The value of X is close to : A
402.5 ohm
B
401.5 ohm
C
403.5 ohm
D
404.5 ohm
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination