1
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
In the given circuit all resistances are of value $$R$$ $$ohm$$ each. The equivalent resistance between $$A$$ and $$B$$ is :

A
$$2R$$
B
$$3R$$
C
$${{5R} \over 3}$$
D
$${{5R} \over 2}$$
2
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A uniform wire of length 1 and radius r has a resistance of 100 $$\Omega$$. It is recast into a wire of radius $${r \over 2}.$$ The resistance of new wire will be :
A
1600 $$\Omega$$
B
400 $$\Omega$$
C
200 $$\Omega$$
D
100 $$\Omega$$
3
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance P = 4 $$\Omega$$ and the neutral point N is at 60 cm from A. Now an unknown resistance R is connected in series to P and the new position of the neutral point is at 80 cm from A. The value of unknown resistance R is :

A
$${{33} \over 5}\,\Omega$$
B
6 $$\,\Omega$$
C
7 $$\,\Omega$$
D
$${{20} \over 3}\,\Omega$$
4
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The figure shows three circuits I, II and III which are connected to a 3V battery. If the powers dissipated by the configurations I, II and III are P1 , P2 and P3 respectively, then :

A
P1 > P2 > P3
B
P1 > P3 > P2
C
P2 > P1 > P3
D
P3 > P2 > P1
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