1
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
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 :-
A
0.25 V
B
0.20 V
C
0.50V
D
0.75 V
2
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when :-
A
R = 1000 r
B
R = r
C
R = 2r
D
R = 0.001 r
3
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
In the figure shown, what is the current (in Ampere) drawn from the battery ?
You are given: R1 = 15$$\Omega$$, R2 = 10 $$\Omega$$, R3 = 20 $$\Omega$$, R4 = 5$$\Omega$$, R5 = 25$$\Omega$$, R6 = 30 $$\Omega$$, E = 15 V
A
13/24
B
7/18
C
9/32
D
20/3
4
JEE Main 2019 (Online) 8th April Morning Slot
+4
-1
A 200 $$\Omega$$ resistor has a certain color code. If one replaces the red color by green in the code, the new resistance will be :
A
500 $$\Omega$$
B
100 $$\Omega$$
C
200 $$\Omega$$
D
300 $$\Omega$$
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