1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In a conductor, if the number of conduction electrons per unit volume is 8.5 × 1028 m–3 and mean free time is 25ƒs (femto second), it's approximate resistivity is :-
(me = 9.1 × 10–31 kg)
A
10–8 $$\Omega $$m
B
10–7 $$\Omega $$m
C
10–5 $$\Omega $$m
D
10–6 $$\Omega $$m
2
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is : (E is mid-point of arm CD) JEE Main 2019 (Online) 9th April Morning Slot Physics - Current Electricity Question 210 English
A
$${7 \over {64}}R$$
B
$${1 \over {16}}R$$
C
R
D
$${3 \over {4}}R$$
3
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A moving coil galvanometer has resistance 50$$\Omega $$ and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5 k$$\Omega $$ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to :
A
15 V
B
10 V
C
40 V
D
20 V
4
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is r = 0.01 $$\Omega $$/cm. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be :- JEE Main 2019 (Online) 8th April Evening Slot Physics - Current Electricity Question 213 English
A
0.25 V
B
0.20 V
C
0.50V
D
0.75 V
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