1
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 239 English
A
3A
B
5A
C
4A
D
2A
2
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 238 English
A
270 $$\Omega $$, 10 %
B
27 k$$\Omega $$, 10 %
C
27 k$$\Omega $$, 20 %
D
270 $$\Omega $$, 5 %
3
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
4
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A galvanometer with its coil resistance 25 $$\Omega $$ requires a current of 1 mA for its full deflection. In order to construct an ammeter to read upto a current of 2 A, the approximate value of the shunt resistance should be :
A
$$2.5 \times {10^{ - 3}}\,\Omega $$
B
$$1.25 \times {10^{ - 2}}\Omega $$
C
$$1.25 \times {10^{ - 3}}\Omega $$
D
$$2.5 \times {10^{ - 2}}\Omega $$
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