Consider a rectangular slab of length 
and area of cross section 
A current 
is passed through it. If the length is doubled, the potential drop across the end faces
a)
Becomes half of the initial value
b)
Becomes one-fourth of the initial value
c)
Becomes double the initial value
d)
Remains same
Consider a rectangular slab of length and area of cross section A current is passed through it. If the length is doubled, the potential drop across the end faces
a)
Becomes half of the initial value
b)
Becomes one-fourth of the initial value
c)
Becomes double the initial value
d)
Remains same
Question ID - 150218 | SaraNextGen Top Answer
Consider a rectangular slab of length and area of cross section A current is passed through it. If the length is doubled, the potential drop across the end faces
a)
Becomes half of the initial value
b)
Becomes one-fourth of the initial value
c)
Becomes double the initial value
d)
Remains same
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Consider a rectangular slab of length |
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|
a) |
Becomes half of the initial value |
b) |
Becomes one-fourth of the initial value |
|
c) |
Becomes double the initial value |
d) |
Remains same |
(c)
Resistance of the slab 
where
.png)
The potential across 
is 
The length of the slab is doubled. Therefore the resistance is 
Assuming that the same current is passed, the potential across the new resistance is 