Electronic Devices and Circuits Questions and Answers – The Hall Effect

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “The Hall Effect”.

1. In the Hall Effect, the directions of electric field and magnetic field are parallel to each other.
The above statement is
a) True
b) False
View Answer

Answer: b
Explanation: To make Lorentz force into the effect, the electric field and magnetic field should be perpendicular to each other.

2. Which of the following parameters can’t be found with Hall Effect?
a) Polarity
b) Conductivity
c) Carrier concentration
d) Area of the device
View Answer

Answer: d
Explanation: The Hall Effect is used for finding the whether the semiconductor is of n-type or p-type, mobility, conductivity and the carrier concentration.

3. In the Hall Effect, the electric field is in x direction and the velocity is in y direction. What is the direction of the magnetic field?
a) X
b) Y
c) Z
d) XY plane
View Answer

Answer: c
Explanation: The Hall Effect satisfies the Lorentz’s Force which is
E=vxB
So, the direction of the velocity, electric field and magnetic field should be perpendicular to each other.
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4. What is the velocity when the electric field is 5V/m and the magnetic field is 5A/m?
a) 1m/s
b) 25m/s
c) 0.2m/s
d) 0.125m/s
View Answer

Answer: a
Explanation: E=vxB
v=E/B
=5/5
=1m/s.

5. Calculate the hall voltage when the Electric Field is 5V/m and height of the semiconductor is 2cm.
a) 10V
b) 1V
c) 0.1V
d) 0.01V
View Answer

Answer: c
Explanation: Vh=E*d
=5*2/100
=0.1V.

6. Which of the following formulae doesn’t account for correct expression for J?
a) ρv
b) I/wd
c) σE
d) µH
View Answer

Answer: d
Explanation: B=µH
So, option µH is correct option.

7. Calculate the Hall voltage when B=5A/m, I=2A, w=5cm and n=1020.
a) 3.125V
b) 0.3125V
c) 0.02V
d) 0.002V
View Answer

Answer: d
Explanation: Vh=BI/wρ
=5=2/ (5*10-2*105*1.6*10-19)
=0.002V.
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8. Calculate the Hall Effect coefficient when number of electrons in a semiconductor is 1020.
a) 0.625
b) 0.0625
c) 6.25
d) 62.5
View Answer

Answer: b
Explanation: R=1/ρ
=1/(1.6*10-19*1020)
=0.0625.

9. What is the conductivity when the Hall Effect coefficient is 5 and mobility is 5cm2 /s.
a) 100 S/m
b) 10 S/m
c) 0.0001S/m
d) 0.01 S/m
View Answer

Answer: c
Explanation: µ=σR
σ =µ/R
=5*10-4/5
=0.0001 S/m.
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10. In Hall Effect, the electric field applied is perpendicular to both current and magnetic field?
a) True
b) False
View Answer

Answer: a
Explanation: In Hall Effect, the electric field is perpendicular to both current and magnetic field so that the force due to magnetic field can be balanced by the electric field or vice versa.

Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.

To practice all areas of Electronic Devices and Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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