1
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
When the switch S, in the circuit shown, is closed, then the value of current i will be :

A
3A
B
5A
C
4A
D
2A
2
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
Out of Syllabus
A resistance is shown in the figure. Its value and tolerance are given respectively by :

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
+4
-1
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
+4
-1
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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