A piece of wire of resistance is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is , what is the ratio ?
Answer and explanation
Correct answer: B.
- Step 1: When cut into 5 equal parts, the resistance of each piece is .
- Step 2: When 5 identical resistors of resistance are connected in parallel, .
- Step 3: Therefore, , which implies the ratio .
Answer
.
Why not the others: is the reciprocal of each piece; divides once; and is the inverted ratio .
Practise more Life Processes and Physical Phenomena.
Free questions with an explanation for every one, and full timed CBSE Class 10 mock tests.
More Life Processes and Physical Phenomena questions
- In the human digestive system, which enzyme present in saliva initiates the chemical digestion of dietary starch into maltose?
- During anaerobic respiration in yeast cells (fermentation), glucose is broken down into which end products?
- What is the basic functional and structural filtration unit of the human kidney?
- An object is placed at a distance of in front of a concave mirror of focal length . What is the nature and posi…
- If the absolute refractive indices of water and glass are and respectively, what is the refractive index of glass with respect t…
- Which component of the human eye adjusts the focal length of the eye lens to facilitate accommodation for viewing objects at varying distanc…