1
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In the given circuit the the internal resistance of the 18 V cell is negligible. If R1 = 400 $$\Omega $$, R3 = 100 $$\Omega $$ and R4 = 500 $$\Omega $$ and the reading of an ideal voltmeter across R4 is 5V, then the value of R2 will be :

JEE Main 2019 (Online) 9th January Evening Slot Physics - Current Electricity Question 246 English
A
300 $$\Omega $$
B
450 $$\Omega $$
C
550 $$\Omega $$
D
230 $$\Omega $$
2
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
When the switch S, in the circuit shown, is closed, then the value of current i will be :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Current Electricity Question 250 English
A
3A
B
5A
C
4A
D
2A
3
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A resistance is shown in the figure. Its value and tolerance are given respectively by :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Current Electricity Question 249 English
A
270 $$\Omega $$, 10 %
B
27 k$$\Omega $$, 10 %
C
27 k$$\Omega $$, 20 %
D
270 $$\Omega $$, 5 %
4
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm2, is $$\upsilon $$. If the electron density in copper is 9 $$ \times $$ 1028/m3 the value of $$\upsilon $$. in mm/s is close to (Take charge of electron to be = 1.6 $$ \times $$ 10$$-$$19C)
A
0.02
B
3
C
2
D
0.2
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