Question:
Which of the element in the following is not bilateral ?
Which of the element in the following is not bilateral ?
Show Hint
Bilateral elements:
\[
R,\;L,\;C
\]
Unilateral elements:
\[
\text{Diode, Transistor}
\]
Their behavior depends on direction of current flow.
Updated On: May 22, 2026
- Resistor
- Inductor
- Capacitor
- Transistor
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The Correct Option is D
Solution and Explanation
Concept:
A bilateral element behaves the same way for current flow in both directions.
Its voltage-current relationship remains unchanged when direction is reversed.
Examples:
• resistor,
• inductor,
• capacitor. A unilateral element behaves differently in different directions.
Step 1: Understanding bilateral elements. For bilateral elements: \[ V-I \text{ characteristics remain same in both directions} \] Thus electrical behavior is symmetrical.
Step 2: Checking resistor. A resistor obeys: \[ V=IR \] Current can flow in either direction and resistance remains same. Hence resistor is bilateral.
Step 3: Checking inductor. An inductor opposes change in current similarly in both directions. Its inductive behavior does not depend on current direction. Hence inductor is bilateral.
Step 4: Checking capacitor. A capacitor stores energy in electric field and behaves similarly in both directions for AC operation. Hence capacitor is bilateral.
Step 5: Checking transistor. A transistor does not behave identically in both directions. Its operation depends on:
• proper biasing,
• emitter-base and collector-base junction orientation. Thus its characteristics are directional. Therefore transistor is a unilateral device.
Step 6: Selecting the correct answer. Hence the element which is not bilateral is: \[ \boxed{(4)\text{ Transistor}} \]
• resistor,
• inductor,
• capacitor. A unilateral element behaves differently in different directions.
Step 1: Understanding bilateral elements. For bilateral elements: \[ V-I \text{ characteristics remain same in both directions} \] Thus electrical behavior is symmetrical.
Step 2: Checking resistor. A resistor obeys: \[ V=IR \] Current can flow in either direction and resistance remains same. Hence resistor is bilateral.
Step 3: Checking inductor. An inductor opposes change in current similarly in both directions. Its inductive behavior does not depend on current direction. Hence inductor is bilateral.
Step 4: Checking capacitor. A capacitor stores energy in electric field and behaves similarly in both directions for AC operation. Hence capacitor is bilateral.
Step 5: Checking transistor. A transistor does not behave identically in both directions. Its operation depends on:
• proper biasing,
• emitter-base and collector-base junction orientation. Thus its characteristics are directional. Therefore transistor is a unilateral device.
Step 6: Selecting the correct answer. Hence the element which is not bilateral is: \[ \boxed{(4)\text{ Transistor}} \]
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