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NEET 2026
Exam
NEET
Year
2026
Subject
Physics
Chapter
Chapter

NEET 2026 · Physics · Chapter

An ideal step-up transformer is used in a power transmission...

An ideal step-up transformer is used in a power transmission station. It is connected to a 200 V200\text{ V} AC mains supply and draws a primary current of 10 A10\text{ A}. If the voltage across the secondary coil is stepped up to 4000 V4000\text{ V}, what is the current flowing in the secondary circuit?

Options

  1. A0.5 A0.5\text{ A}
  2. B5.0 A5.0\text{ A}
  3. C20 A20\text{ A}
  4. D200 A200\text{ A}

Correct answer

A. 0.5 A0.5\text{ A}

Step-by-step solution

For an ideal transformer, the input power is equal to the output power.

VpIp=VsIsV_p I_p = V_s I_s

Substituting the given values:

200×10=4000×Is200 \times 10 = 4000 \times I_s

2000=4000Is2000 = 4000 I_s

Is=20004000=0.5 AI_s = \dfrac{2000}{4000} = 0.5\text{ A}

Answer: 0.5 A0.5\text{ A}
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