1
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A constant voltages is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be :
A
Doubled
B
Halved
C
Unchanged
D
Increased 8 times
2
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
JEE Main 2018 (Online) 15th April Morning Slot Physics - Current Electricity Question 255 English
In a meter bridge, as shown in the figure, it is given that resistance $$Y = 12.5\,\,\Omega $$ and that the balance is obtained at a distance $$39.5$$ $$cm$$ from end $$A$$ (by Jockey J). After interchanging the resistances $$X$$ and $$Y$$, a new balance point is found at a distance $${l_2}$$ from end $$A.$$ What are the value of $$X$$ and $${l_2}$$ ?
A
$$8.16\,\,\Omega $$ and $$60.5$$ $$cm$$
B
$$19.15\,\,\Omega $$ and $$39.5$$ $$cm$$
C
$$8.16\,\,\Omega $$ and $$39.5$$ $$cm$$
D
$$19.15\,\,\Omega $$ and $$60.5$$ $$cm$$
3
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In the given circuit all resistances are of value $$R$$ $$ohm$$ each. The equivalent resistance between $$A$$ and $$B$$ is :

JEE Main 2018 (Online) 15th April Morning Slot Physics - Current Electricity Question 254 English
A
$$2R$$
B
$$3R$$
C
$${{5R} \over 3}$$
D
$${{5R} \over 2}$$
4
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 $$\Omega $$
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