Discussion
A transducer converts
1. A potential difference is developed across a current carrying metal strip when the strip is placed in transverse magnetic field.
2. The Hall effect is very weak in metals but large in semiconductors.
3. The Hall effect is very weak in semiconductors but is large in metals.
4. It is applied in the measurement of the magnetic field intensity.
Codes :
Answer: D
This is the Hall effect: a potential difference appears across a current-carrying strip placed in a transverse magnetic field, so statement 1 is correct. The effect is small in metals, where the carrier density is huge, and large in semiconductors, where it is much smaller, so statement 2 is right and statement 3 is the reverse. Since the Hall voltage is proportional to the field, it is used to measure magnetic field intensity: statement 4 is correct. The answer is 1, 2 and 4.
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