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Current Electricity — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsCurrent Electricity1 Mark
MCQ
Read the case and answer the following questions:
Case 1: 2 A current is flowing through a copper wire X of length 2 km and radius 2 cm.
Case 2: 4 A current is flowing through a copper wire Y of length 1 km and radius 2 cm.
Case 3: A copper wire Z carrying P amount of current by having potential difference of 16 V and resistance of 2 ohm.
Answer the following question?
(i) Which wire is carrying maximum amount of current?
  • A
    Wire X
  • B
    Wire Y
  • ✓
    Wire Z
  • D
    Wire X and Wire Z
✓

Answer

Correct option: C.
Wire Z
(c)
Wire Z
Explanation:
Current carried by wire $Z$ is $\frac{16}{2}=8 A$, which is more that wire $X$ and $Y$.

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