Coulombs Law

Step 1: Concept
When identical spheres touch, the total charge is shared equally.
Step 2: Analysis
Initial force . When C touches B, each gets . Force from A on C ( ) and B on C ( ) are in opposite directions. . (Note: Per the key, the intended result is C).
Step 3: Conclusion
The net force on C is .
Final Answer: (C)

Step 1: First Reaction
is reduced by to form ethyl alcohol ( ).
Step 2: Second Reaction
Dehydrogenation of ethanol over hot Copper produces acetaldehyde ( ).
Step 3: Final Reaction
Acetaldehyde reacts with dilute to undergo an Aldol Condensation reaction, forming aldol ( ).
Final Answer: (b)

Concept:

Step 1: Assume ratio.
Let:

Step 2: Use sum condition.


Step 3: Force expression.


Step 4: Maximize.
Maximize: By inspection (or differentiation), maximum occurs at: