GATE Physics: Questions 77 - 80 of 290

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 290 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 200.00 or

Question number: 77

» Electromagnetic Theory » Electromagnetic Waves and Their Reflection

Appeared in Year: 2014

Short Answer Question▾

Write in Short

The electric field of a uniform plane wave propagating in a dielectric, non – conducting medium is given by,

E=x^10cos(6π×107t0.4πz)Vm

The phase velocity of the wave is ________ ×108ms

Question number: 78

» Nuclear and Particle Physics » Conservation Laws

Appeared in Year: 2015

MCQ▾

Question

The decay μ+e++γ is forbidden, because it violates –

Choices

Choice (4) Response

a.

Baryon and lepton number conservation

b.

Angular momentum conservation

c.

Momentum and lepton number conservations

d.

Lepton number conservation

Question number: 79

» Nuclear and Particle Physics » Nuclear Models

Appeared in Year: 2014

Short Answer Question▾

Write in Short

For Nickel the number density is 8×1023atomscm3 and electronic configuration is 1s22s22p63s23p63d84s2 . The value of the saturation magnetization of Nickel in its ferromagnetic state is _×109Am .

(Given the value of Bohr magneton μB=9.21×1021Am2 )

Question number: 80

» Electromagnetic Theory » Biot - Savart's and Ampere's Laws

Appeared in Year: 2015

MCQ▾

Question

A charge q is distributed uniformly over a sphere, with a positive charge q at its centre in fig.(i) . Also in fig.(ii) , a charge q is distributed uniformly over an ellipsoid with a positive charge q at its centre. With respect to the origin of the coordinate system, which one of the following statements is correct?

Charge distribution over sphere and ellipsoid

Charge Distribution Over Sphere and Ellipsoid

In figure – i uniform charge distribution over a sphere and in figure – ii uniform charge distribution over an ellipsoid.

Choices

Choice (4) Response

a.

The dipole moment is non – zero in both figure (i) and figure (ii)

b.

The dipole moment is non – zero in figure (i) but zero in figure (ii)

c.

The dipole moment is zero in figure (i) but non – zero in figure (ii)

d.

The dipole moment is zero in both figure (i) and figure (ii)

Sign In