1
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The resistance of a conductor at 15$$^\circ$$C is 16$$\Omega$$ and at 100$$^\circ$$C is 20$$\Omega$$. What will be the temperature coefficient of resistance of the conductor?
A
0.010$$^\circ$$C$$-$$1
B
0.033$$^\circ$$C$$-$$1
C
0.003$$^\circ$$C$$-$$1
D
0.042$$^\circ$$C$$-$$1
2
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In the given figure, a battery of emf E is connected across a conductor PQ of length 'l' and different area of cross-sections having radii r1 and r2 (r2 < r1).

JEE Main 2021 (Online) 27th July Morning Shift Physics - Current Electricity Question 158 English
Choose the correct option as one moves from P to Q :
A
Drift velocity of electron increases.
B
Electric field decreases.
C
Electron current decreases.
D
All of these
3
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In the given potentiometer circuit arrangement, the balancing length AC is measured to be 250 cm. When the galvanometer connection is shifted from point (1) to point (2) in the given diagram, the balancing length becomes 400 cm. The ratio of the emf of two cells, $${{{\varepsilon _1}} \over {{\varepsilon _2}}}$$ is :

JEE Main 2021 (Online) 25th July Evening Shift Physics - Current Electricity Question 159 English
A
$${5 \over 3}$$
B
$${8 \over 5}$$
C
$${4 \over 3}$$
D
$${3 \over 2}$$
4
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The given potentiometer has its wire of resistance 10$$\Omega$$. When the sliding contact is in the middle of the potentiometer wire, the potential drop across 2$$\Omega$$ resistor is :

JEE Main 2021 (Online) 25th July Evening Shift Physics - Current Electricity Question 160 English
A
10 V
B
5 V
C
$${{40} \over 9}$$ V
D
$${{40} \over 11}$$ V
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