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Assertion (A): An electron having charge - e and mass m and lying in an electric field E is subjected to an acceleration - (e/m) E. Reason (R): If there are n electrons/m^{3} moving with velocity v_{x} and each electron has a charge - e, the current density J = - n ev_{x}. | |
A. | Both A and R are true and R is correct explanation of A [Wrong Answer] |
B. | Both A and R are true but R is not correct explanation of A [Correct Answer] |
C. | A is true but R is false [Wrong Answer] |
D. | A is false but R is true [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
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⇒ In gases the flow of current is due to
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⇒ Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C
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positive edge triggered
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⇒ In gases the flow of current is due to
positive ions only
electrons only
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⇒ Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C
0.5
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⇒ A n-type silicon sample contains a donor concentration of N_{d} = 2 x 10^{16} cm^{-3}. The minority carrier hole lifetime is t_{p0} = 5 μs. The thermal equilibrium generation rate of hole is:
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⇒ In a picture tube, the video signal is applied to
cathode
grid
any anode
either cathode or grid
⇒ A series R-L circuit has R = 1 Ω and L = 1 H. It is excited by a V battery at t = 0. The steady state condition is reached at
t = 1 s
t = 0.1 s
t = 0 s
t = ∞
⇒ An 8 level encoding scheme is used in a PCM system of 10 kHz channel BW. The channel capacity is
80 kbps
60 kbps
30 kbps
18 kbps
⇒ Which of the following statement about TRIAC is incorrect?
It is not particularly suited to A.C. or mains power control
Any one of its main terminals can be used either as cathode or as anode
It can be triggered in response to both positive and negative gate terminals
None of the above
⇒ In an op-amp comparator, the positive or negative output is
saturated
amplifier
unsaturated
any of the above
⇒ Which curve represents the fidelity curve of a standard recei
Curve A
Curve B
Curve C
Curve D
⇒ The amount of time between the creation and disappearance of a hole in an intrinsic semiconductor material is called
life cycle
recombination time
life time
half life
⇒ In following figure, what will be R_{1} and R_{2} for maximum symmetrical swing if V_{CSat} ≈ 0. Given that R_{E} = 200 Ω, R_{C} = 400 Ω, V_{CC} = 20 V, β
6 k
3 k, 6 k
9.9 k, 2.4 k
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⇒ A silicon PN junction diode under reverse bias has depletion region of width 10 μm. The relative permittivity of silicon, ε_{r} = 11.7 and the permittivity of free space ε_{0} = 8.85 x 10^{-12} F/m. The depletion capacitance of the diode per square meter is
100 μF
10 μF
1 μF
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⇒ In a controlled rectifier a freewheeling diode is necessary if the load is
inductive
resistive
capacitive
any of the above
⇒ The most commonly used bias in BJT amplifier circuits is
voltage divider bias
emitter bias
collector bias
collector feedback bias
⇒ The given figure shows dB magnitude plots for type 0, type 1 and type 2 systems. Out of t
curves 1, 2, 3 are for type 0, 1, 2 systems respectively
curves 1, 2, 3 are for type 2, 1, 0 systems respectively
curves 1, 2, 3 are for type 1, 0, 2 systems respectively
curves 1, 2, 3 are for type 1, 2, 0 systems respectively
⇒ For representing two sinusoidal voltages on a phasor diagram
Both voltages must be of the same frequency
Both voltages must be sinusoidal but may be of different frequencies
One of the voltages must be of 50 Hz
The frequency of one must be integral of that of other
⇒ The pointer of an indicating instrument should be
very light
very heavy
neither heavy nor light
heavy
⇒ A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is
10 sin (200t + 90°)
10 sin (200t - 90°)
10 sin(1000t + 90°)
10 sin (1000t - 90°)
⇒
Match the following:
List I | List II | ||
---|---|---|---|
A. | PMMC | 1. | Square law type scale |
B. | Moving iron | 2. | Very good response |
C. | Thermo-couple | 3. | Linear scale |
D. | Electrostatic | 4. | Voltmeter |
A-4, B-1, C-2, D-3
A-3, B-2, C-1, D-4
A-4, B-2, C-1, D-3
A-3, B-1, C-2, D-4
⇒ In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is
150 A
75 A
50 A
300 A
⇒ For a random variable x following the probability density function, p(x), shown in figure, the mean and the variance are respective
1/2 and 2/3
1 and 4/3
1 and 2/3
2 and 4/3
⇒ The series element of a band stop filter is
capacitive
inductive
parallel combination of L and C
series combination of L and C
⇒ The scaling factor of an MOS device using constant voltage scaling model, the gate area of the device will be scaled as
1/a
1/a^{2}
1/a^{3}
1/a^{4}
⇒ In a bipolar transistor which current is smallest
collector current
base current
emitter current
any of the three currents
⇒ When the light falling on a photodiode increases, the reverse minority current
increases
increases or decreases
decreases
remains the same
⇒
Assertion (A): An RTD uses platinum coil.
Reason (R): Platinum is a very stable material.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
⇒ Resistivity of copper is nearly
1.56 μ ohm-cm
3.95 μ ohm-cm
14.55 μ ohm-cm
22.05 μ ohm-cm