1
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :

JEE Main 2019 (Online) 11th January Evening Slot Physics - Current Electricity Question 245 English
A
40 $$\Omega $$
B
30 $$\Omega $$
C
20 $$\Omega $$
D
60 $$\Omega $$
2
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
MCQ (Single Correct Answer)
+4
-1
Change Language
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, :

JEE Main 2019 (Online) 11th January Morning Slot Physics - Current Electricity Question 249 English
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
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :

JEE Main 2019 (Online) 11th January Morning Slot Physics - Current Electricity Question 248 English
A
402.5 ohm
B
401.5 ohm
C
403.5 ohm
D
404.5 ohm
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