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Gauss law cannot be expressed in which of the following forms?
Answer: d Explanation: Gauss law can be expressed in differential or point form as, Div (D)= ρv and in integral form as ∫∫ D.ds = Q = ψ . It is not possible to express it using Stoke’s theorem.
Answer: d
Explanation: Gauss law can be expressed in differential or point form as,
Div (D)= ρv and in integral form as ∫∫ D.ds = Q = ψ . It is not possible to express it using
Stoke’s theorem.
See lessThe potential of a coaxial cylinder with charge density 1 unit , inner radius 1m and outer cylinder 2m is (in 109 )
Answer: c Explanation: The potential of a coaxial cylinder will be ρl ln(b/a)/2πε, where ρl = 1, b = 2m and a = 1m. We get V = 12.47 X 109 volts.
Answer: c
Explanation: The potential of a coaxial cylinder will be ρl ln(b/a)/2πε, where ρl = 1, b =
2m and a = 1m. We get V = 12.47 X 109 volts.
See lessFind the potential due to a charged ring of density 2 units with radius 2m and the point at which potential is measured is at a distance of 1m from the ring.
Answer: d Explanation: The potential due to a charged ring is given by λa/2εr, where a = 2m and r = 1m. We get V = 72π volts.
Answer: d
Explanation: The potential due to a charged ring is given by λa/2εr, where a = 2m and r
= 1m. We get V = 72π volts.
See lessThree charged cylindrical sheets are present in three spaces with σ = 5 at R = 2m, σ = -2 at R = 4m and σ = -3 at R = 5m. Find the flux density at R = 1m.
Answer: a Explanation: Since 1m does not enclose any cylinder (three Gaussian surfaces of radius 2m, 4m, 5m exists), the charge density and charge becomes zero according to Gauss law. Thus flux density is also zero.
Answer: a
Explanation: Since 1m does not enclose any cylinder (three Gaussian surfaces of
radius 2m, 4m, 5m exists), the charge density and charge becomes zero according
to Gauss law. Thus flux density is also zero.
See lessGiven E = 40xyi + 20×2 j + 2k. Calculate the potential between two points (1,-1,0) and (2,1,3).
Answer: b Explanation: V = -∫ E.dl = -∫ (40xy dx + 20x2 dy + 2 dz), from (2,1,3) to (1,-1,0), we get Vpq on integrating from Q to P. Vpq = 106 volts.
Answer: b
Explanation: V = -∫ E.dl = -∫ (40xy dx + 20×2 dy + 2 dz), from (2,1,3) to (1,-1,0), we get
Vpq on integrating from Q to P. Vpq = 106 volts.
See lessThe potential difference in an open circuit is
Answer: c Explanation: In an open circuit no current exists due to non-existence of loops. Also voltage/potential will be infinity in an open circuit
Answer: c
Explanation: In an open circuit no current exists due to non-existence of loops. Also
voltage/potential will be infinity in an open circuit
See lessThe potential taken between two points across a resistor will be
Answer: b Explanation: The resistor will absorb power and dissipate it in the form of heat energy. The potential between two points across a resistor will be negative.
Answer: b
Explanation: The resistor will absorb power and dissipate it in the form of heat energy.
The potential between two points across a resistor will be negative.
See lessWhat is the potential difference between 10sinθcosφ/r 2 at A(1,30,20) and B(4,90,60)?
Answer: c Explanation: Potential at A, Va = 10sin30cos20/12 = 4.6985 and Potential at B, Vb = 10sin90cos60/42 = 0.3125. Potential difference between A and B is, Vab = 4.6985 – 0.3125 = 4.386 volts.
Answer: c
Explanation: Potential at A, Va = 10sin30cos20/12 = 4.6985 and Potential at B, Vb =
10sin90cos60/42 = 0.3125. Potential difference between A and B is, Vab = 4.6985 –
0.3125 = 4.386 volts.
See lessThe voltage at any point in an ac circuit will be
Answer: b Explanation: In any ac circuit, the voltage measured will not be exact maximum. In order to normalise, we assume the instantaneous voltage at any point be 70.7% of the peak value, which is called the root mean square (RMS)voltage.
Answer: b
Explanation: In any ac circuit, the voltage measured will not be exact maximum. In order
to normalise, we assume the instantaneous voltage at any point be 70.7% of the peak
value, which is called the root mean square (RMS)voltage.
See lessDivergence theorem is based on
Answer: a Explanation: The divergence theorem relates surface integral and volume integral. Div(D) = ρv, which is Gauss’s law.
Answer: a
Explanation: The divergence theorem relates surface integral and volume integral.
Div(D) = ρv, which is Gauss’s law.
See less