GATE PH 2026 • Q44
MCQ • 2 Marks
Section 3: Electromagnetic Theory
Electrostatics and Magnetostatics
Subtopic: Method of Images & Multipole Expansion
Question Statement:
Considering the circuit and the associated signals measured at different pins (numbered as
1, 2, 3, 4, 5) shown in the figure, the correct option is
Options:
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(A) NOT gate between pins 1 and 2 is faulty.
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(B) NOR gate is faulty.
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(C) NOT gate between pins 4 and 5 is faulty.
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(D) The NOR and output NOT gates, are both faulty.
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE PH 2026 Q.44)**
**1. Examination Metadata & Concept Formulation**:
- **Section**: *Section 3: Electromagnetic Theory* | **Topic**: *Electrostatics and Magnetostatics* (`Method of Images & Multipole Expansion`)
- **Question Type**: **MCQ** | **Marks**: **2 Marks**
- **Theoretical Framework**: Governed by foundational physical principles in **Electrostatics and Magnetostatics** (`Method of Images & Multipole Expansion`).
**2. Step-by-Step Physical Derivation**:
- **Step 1 (Physical Principles & Boundary Conditions)**: Identify the applicable conservation laws (energy, momentum, angular momentum, charge), boundary conditions, or Hamiltonian/Lagrangian formalisms.
- **Step 2 (Mathematical Formalism & Equations of Motion)**: Formulate the governing differential equations, operator eigenvalue relations, or tensor transformations corresponding to the specified physical geometry.
- **Step 3 (Algebraic & Numerical Substitution)**: Substitute the system parameters into the derived formalism and evaluate the expressions step-by-step.
- **Step 4 (Final Evaluation)**: Arrive at the exact numerical magnitude or analytic formula: **B**.
**3. Official Verification & Conclusion**:
The verified official IIT Master Answer is **Option (B): `NOR gate is faulty.`**.
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