1
JEE Main 2021 (Online) 26th August Evening Shift
+4
-1
An electric bulb of 500 watt at 100 volt is used in a circuit having a 200 V supply. Calculate the resistance R to be connected in series with the bulb so that the power delivered by the bulb is 500 W.
A
20 $$\Omega$$
B
30 $$\Omega$$
C
5 $$\Omega$$
D
10 $$\Omega$$
2
JEE Main 2021 (Online) 26th August Morning Shift
+4
-1
In the given figure, the emf of the cell is 2.2 V and if internal resistance is 0.6$$\Omega$$. Calculate the power dissipated in the whole circuit :
A
1.32 W
B
0.65 W
C
2.2 W
D
4.4 W
3
JEE Main 2021 (Online) 26th August Morning Shift
+4
-1
What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent resistance of 3$$\Omega$$ ?

(Given resistivities of iron and copper-nickel alloy wire are 12 $$\mu$$$$\Omega$$ and 51 $$\mu$$$$\Omega$$ cm respectively)
A
82 m
B
97 m
C
110 m
D
90 m
4
JEE Main 2021 (Online) 27th July Evening Shift
+4
-1
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
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