GATE Physics: Questions 69 - 72 of 290

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Question number: 69

» Electronics » Field Effect Transistors

Appeared in Year: 2015

Short Answer Question▾

Write in Short

In the given circuit, the voltage across the source resistor is 1 V. The drain voltage (in V) is ________.

A circuit diagram consist of JFET

A Circuit Diagram Consist of JFET

Figure shows a circuit consists of three resistors and a JFET, the voltage across the source resistor is 1 V.

Question number: 70

» Thermodynamics and Statistical Physics » Black-Body Radiation and Planck's Distribution Law

Appeared in Year: 2015

MCQ▾

Question

For a black body radiation in a cavity, photons are created and annihilated freely as a result of emission and absorption by the walls of the cavity. This is because –

Choices

Choice (4) Response

a.

Photons are spin – 1 particle

b.

The chemical potential of the photons is zero

c.

Photons obey Pauli exclusion principle

d.

The entropy of the photons is very large.

Question number: 71

» Atomic and Molecular Physics » Zeeman and Stark Effects

Appeared in Year: 2015

Short Answer Question▾

Write in Short

The number of permitted transitions from 2P322S12 in the present of a weak magnetic field is ________.

Question number: 72

» Electromagnetic Theory » Solutions of Electrostatic and Magnetostatic Problems

Appeared in Year: 2015

MCQ▾

Question

Given that the magnetic flux through the closed loop PQRSP is ϕ . If PRAdl=ϕ1 along PQR, the value of PRAdl along PSR is –

Showing the closed loop PQRSP

Showing the Closed Loop PQRSP

In figure a closed loop PQRSP is shown.

Choices

Choice (4) Response

a.

ϕ1ϕ

b.

ϕ1

c.

ϕ1

d.

ϕϕ1

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