search
Q: A wire has a resistance of R. If its length is increased by a factor of 8 and its crosssectional area is decreased by a factor of 4, what is its new resistance (R')? एक तार का प्रतिरोध R है। यदि इसकी लम्बाई 8 गुना बढ़ा दी जाए तथा इसके अनुप्रस्थ काट क्षेत्रफल को चौथाई (1/4) कम कर दिया जाए, तो इसका नया प्रतिरोध (R) क्या होगा?
  • A. R' = 32 R
  • B. R' = 2 R
  • C. R' = 8 R
  • D. R' = 16 R
Correct Answer: Option A -
answer image

Explanations:

explanation image