MCQ
Materials $'X$ and $'Y'$ in the figure are.


- A$X$$Y$Aluminium foilPencil lead
- B$X$$Y$Pencil leadCopper block
- ✓$X$$Y$Pencil leadWooden block
- D$X$$Y$Copper blockPencil lead

|
$X$
|
$Y$
|
|
Aluminium foil
|
Pencil lead
|
|
$X$
|
$Y$
|
|
Pencil lead
|
Copper block
|
|
$X$
|
$Y$
|
|
Pencil lead
|
Wooden block
|
|
$X$
|
$Y$
|
|
Copper block
|
Pencil lead
|
|
$X$
|
$Y$
|
|
Pencil lead
|
Wooden block
|
|
$X$
|
$Y$
|
|
Pencil lead
|
Wooden block
|
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