Asked: Chhattisgarh P.C.S. (Pre) 2015medium Level
QUESTION STATEMENT:द्विभाषी / Bilingual
एक तार में बहती विद्युत धारा एवं विभवांतर प्रत्येक को दो गुना बढ़ा दिया जाए, तो विद्युत शक्ति-
If the electric current flowing in a wire and the potential difference are both doubled, the electric power will:
SELECT CORRECT OPTION:
A
प्रभावित नहीं होगी
Not be affected
B
चार गुना बढ़ जाएगी
Increase four times
Correct
C
दो गुना बढ़ जाएगी
Increase two times
D
घटकर आधी हो जाएगी
Decrease to half
E
इनमें से कोई नहीं
None of these
Official Solution & Explanation:
Correct Answer: Option B(चार गुना बढ़ जाएगी)
विद्युत शक्ति $P = V \times I$। यदि $V$ तथा $I$ दोनों को दोगुना कर दिया जाए:
$$P' = (2V) \times (2I) = 4 (VI) = 4P$$
अतः विद्युत शक्ति चार गुना बढ़ जाएगी।
Power is $P = V \times I$. If both voltage and current are doubled, new power $P' = (2V)(2I) = 4VI = 4P$, so power increases fourfold.
Subject: General Science•Topic: Electric Current•Subtopic: Electric Current
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