Question is ⇒ If J, I and a denote current density, current and area of cross section of a conductor, then, Options are ⇒ (A) J = Ia, (B) J = I/a2, (C) J = I/a, (D) J = Ia2, (E) , Leave your comments or Download question paper.

Question is ⇒ If J, I and a denote current density, current and area of cross section of a conductor, then, Options are ⇒ (A) J = Ia, (B) J = I/a2, (C) J = I/a, (D) J = Ia2, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	If J, I and a denote current density, current and area of cross section of a conductor, then
A.	J = Ia [Wrong Answer]
B.	J = I/a² [Wrong Answer]
C.	J = I/a [Correct Answer]
D.	J = Ia² [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Radiowaves are electromagnetic waves having frequency range
0.001 to 50 H
0.001 to 50 kHz
0.002 to 50 MHz
0.001 to 10¹⁶ Hz

⇒ The main systems used for generation of SSB are
filter method
phase cancellation method
third method
all of the above

⇒ For the two port of figure, z_{1126/7 Ω
10/3 Ω
6 Ω
2 Ω}

⇒ In a radio detector
stabilization against signal strength variation is provided
linearity is worse than in a phase discriminator
the circuit is the same as in discriminator except that diodes are reversed
output is twice that obtainable from a similar phase discriminator

⇒ One limitation of constant k filters is that Z₀ is not constant in the pass band.
TRUE
FALSE

⇒ The common emitter short circuit current gain β of a transistor
is a monotonically increasing function of the collector current I_c
is a monotonically decreasing function of I_c
increasing with I_c, for low I_c, reaches a maximum and then decreases with further increase in I_c
is not a function of I_c

⇒ The Boolean expression for the shaded area in the Venn diagra
X + Y + Z
XY + Z + X YZ
X Y Z + XY
X + Y + Z

⇒ The main purpose of using transformer coupling in a class A amplifier is to make it more
efficient
less costly
less bulky
distortion free

⇒

Assertion (A): In a circuit having high inductance, reactive power may be more than apparent power.

Reason (R): Reactive power = VI sin θ.

Both A and R are true and R is correct explanation of A
Both A and R are true and R is not the correct explanation of A
A is true but R is false
A is false but R is true

⇒ 8085 data bus has 8 lines and is bidirectional.
TRUE
FALSE

⇒ Which of the following is a valid integer constant?
17
-18.58
101.14
-810

⇒

Assertion (A): Laplace transform of impulse function is equal to area under the impulse.

Reason (R): An impulse function whose area is unity is called unit impulse function.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
R is correct but A is wrong

⇒ The dominant mode in a rectangular wave-guide is
TE₀₁
TM₀₁
TE₁₀
TM₁₁

⇒ If E (i.e., available energy state) = E_F(i.e., Fermi level), then probability that state E will be occupied is 0.5 for any temperature T.
TRUE
FALSE

⇒ An n type semiconductor is illuminated by a steady flux of photons with energy greater than the band gap energy. The change in conductivity Δσ obeys which relati
Δσ = 0
Δσ = e(σ_n + σ_p) Δ_n
Δσ = e(μ_nΔ_n - μ_pΔ_p)
Δσ = e μ_nΔ_n

⇒ A constant k high pass filter has f_c = 3000 Hz. At f = 1000 Hz, the phase shift is
zero
p
2 p
more than p

⇒ The best excited reflector from a wave guide is
horn
parabolic
biconical
corner

⇒ CMRR is the ratio of differential voltage gain to common mode gain.
TRUE
FALSE

⇒ The process of deliberately adding impurity to a semi-conductor material is called
impurification
pollution
deionisation
doping

⇒ The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means
Demand-Assigned Multiple Access
Decibel Attenuated Microwave Access
Digital Analog Master Antenna
Dynamically-Assigned Multiple Access

⇒ ECL is a saturating logic.
TRUE
FALSE

⇒ Satellite communication uses frequencies in the range of
3 to 6 GHz
3-10 MHZ
10-50 GHz
100-200 GHz

⇒ In figure, I_C &as
I₁
I_B
0.5 I₁
0.5 I_B

⇒ A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is
zero
24.14A
10A
14.14A

⇒ As temperature increases, the temperature coefficient of metals increases.
TRUE
FALSE

⇒ Low frequency boost can be easily compensated by
attenuating the frequencies from 0 to 1.25 MHz
using an appropriate de-emphasis circuit in the receiver
using an appropriate pre-emphasis circuit in the transmitter
none

⇒ In 8086 the flag which enables or disables external interrupts is
IF
DF
TF
CF

⇒ High speed logic circuits use
pulses with very small width
pulses with very large width
pulses whose width is neither small nor large
either (b) or (c)

⇒ The phase angle of lead circuit is
between 0 and -90°
between 0 and +90°
90°
more than 90°

⇒ Zoning is used with a dielectric antenna in order to
permit pin-point focusing
reduce the bulk of the lens
increase the bandwidth of the lens
correct the curvature of the wavefront from a horn that is too short