Question

The electric potential (V ) and electric field (⃗ E) are closely related concepts in electrostatics. The electric field is a vector quantity that represents the

• A. Production of AC is economical.
• B. AC can be easily and efficiently converted from one voltage to another.
• C. AC can be transmitted economically over long distances.
• D. AC is less dangerous.

Hint:

Key advantages of AC over DC: - Easy voltage transformation - Efficient long-distance transmission But safety depends on voltage and current, not just AC vs DC.

Answer 1

The Correct Option is D

Concept: AC (Alternating Current) has several practical advantages over DC (Direct Current):

Easy voltage transformation using transformers
Efficient long-distance transmission
Economical generation
However, safety depends on magnitude and conditions, not simply AC vs DC.
Step 1: Analyze each statement. (A) Production of AC is economical. True. AC generators are simpler and cheaper compared to DC generators. (B) AC can be easily converted from one voltage to another. True. Transformers work only with AC, allowing efficient voltage stepping up/down. (C) AC can be transmitted economically over long distances. True. High-voltage AC transmission reduces power loss (\( I^2R \) losses). (D) AC is less dangerous. Not necessarily true. In fact, AC can be more dangerous than DC at the same voltage because:

Causes continuous muscle contraction
Interferes with heart rhythm (50–60 Hz range)

Step 2: Conclusion. The incorrect statement is that AC is less dangerous.