NEET UG Magnetism, EMI & AC – Topic Test

Topics in this test

Difficulty: 15 medium · 15 hard

Magnetism, EMI & AC MCQ questions with answers

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

1. Q1. A flat coil of 100 turns, each of area 4×10⁻³ m², carries a current of 5 A. The magnitude of its magnetic dipole moment is:

   100 फेरों वाली एक चपटी कुंडली, जिसके प्रत्येक फेरे का क्षेत्रफल 4×10⁻³ m² है, में 5 A की धारा बह रही है। इसके चुंबकीय द्विध्रुव आघूर्ण का परिमाण है:

   • A. 20 A·m²
   • B. 2 A·m²
   • C. 0.5 A·m²
   • D. 4 A·m²
   Solution

   The magnetic moment of a current coil is m = NIA = 100 × 5 × 4×10⁻³ = 2 A·m².

   धारा कुंडली का चुंबकीय आघूर्ण m = NIA = 100 × 5 × 4×10⁻³ = 2 A·m²।

2. Q2. The Bohr magneton, which is the natural unit of atomic magnetic moment, has an approximate value of:

   बोर मैग्नेटॉन, जो परमाणविक चुंबकीय आघूर्ण का प्राकृतिक मात्रक है, का सन्निकट मान है:

   • A. 9.27 × 10⁻²⁸ J/T
   • B. 9.27 × 10⁻²⁴ J/T
   • C. 6.63 × 10⁻³⁴ J/T
   • D. 1.6 × 10⁻¹⁹ J/T
   Solution

   The Bohr magneton μB = eℏ/2mₑ ≈ 9.27 × 10⁻²⁴ J/T (equivalently A·m²).

   बोर मैग्नेटॉन μB = eℏ/2mₑ ≈ 9.27 × 10⁻²⁴ J/T (तुल्य रूप से A·m²) होता है।

3. Q3. A total energy of 45 J is delivered by an electromagnetic wave to a perfectly absorbing surface. The momentum transferred to the surface is: (take c = 3×10^8 m/s)

   एक विद्युतचुंबकीय तरंग द्वारा एक पूर्णतः अवशोषक सतह को कुल 45 J ऊर्जा प्रदान की जाती है। सतह को स्थानांतरित संवेग है: (c = 3×10^8 m/s लीजिए)

   • A. 4.5×10^-9 kg·m/s
   • B. 3×10^-7 kg·m/s
   • C. 1.35×10^10 kg·m/s
   • D. 1.5×10^-7 kg·m/s
   Solution

   For complete absorption the momentum transferred is p = U/c = 45/(3×10^8) = 1.5×10^-7 kg·m/s.

   पूर्ण अवशोषण के लिए स्थानांतरित संवेग p = U/c = 45/(3×10^8) = 1.5×10^-7 kg·m/s होता है।

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