JEE Main Magnetism, EMI and EM Waves – Topic Test

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Difficulty: 15 medium · 15 hard

Magnetism, EMI and EM Waves MCQ questions with answers

The first 3 of 30 questions. Unlock the series for the rest, each with a solution.

1. Q1. Which of the following is NOT equivalent to the SI unit of self-inductance, the henry?

   निम्नलिखित में से कौन-सा स्व-प्रेरकत्व के SI मात्रक, हेनरी, के तुल्य नहीं है?

   • A. V·s/A
   • B. Wb/A
   • C. C/V
   • D. Ω·s
   Solution

   1 H = 1 Wb/A = 1 V·s/A = 1 Ω·s (since Ω = V/A). The coulomb per volt (C/V) is the farad, the unit of capacitance, not inductance.

   1 H = 1 Wb/A = 1 V·s/A = 1 Ω·s (क्योंकि Ω = V/A)। कूलॉम प्रति वोल्ट (C/V) फैराड है, जो धारिता का मात्रक है, प्रेरकत्व का नहीं।

2. Q2. An ideal step-down transformer converts 2200 V to 220 V. If the primary winding has 1000 turns, the number of turns in the secondary winding is:

   एक आदर्श अपचायी (step-down) ट्रांसफॉर्मर 2200 V को 220 V में परिवर्तित करता है। यदि प्राथमिक कुंडलन में 1000 फेरे हैं, तो द्वितीयक कुंडलन में फेरों की संख्या है:

   • A. 100
   • B. 10000
   • C. 200
   • D. 10
   Solution

   For an ideal transformer Ns/Np = Vs/Vp = 220/2200 = 1/10, so Ns = 1000/10 = 100 turns.

   आदर्श ट्रांसफॉर्मर के लिए Ns/Np = Vs/Vp = 220/2200 = 1/10, अतः Ns = 1000/10 = 100 फेरे।

3. Q3. In a plane electromagnetic wave propagating in vacuum, the peak value of the electric field is 48 V m⁻¹. The peak value of the magnetic field is (c = 3 × 10⁸ m s⁻¹)

   निर्वात में संचरित एक समतल विद्युतचुंबकीय तरंग में, विद्युत क्षेत्र का शिखर मान 48 V m⁻¹ है। चुंबकीय क्षेत्र का शिखर मान है (c = 3 × 10⁸ m s⁻¹)

   • A. 1.6 × 10⁻⁷ T
   • B. 1.6 × 10⁻⁸ T
   • C. 1.6 × 10⁻⁶ T
   • D. 48 × 10⁸ T
   Solution

   For an EM wave in vacuum E₀ = cB₀, so B₀ = 48 / (3 × 10⁸) = 1.6 × 10⁻⁷ T.

   निर्वात में एक विद्युतचुंबकीय तरंग के लिए E₀ = cB₀, अतः B₀ = 48 / (3 × 10⁸) = 1.6 × 10⁻⁷ T।

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