GATE Physics: Questions 220 - 222 of 323

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Question number: 220

» Thermodynamics and Statistical Physics » First and Second Order Phase Transitions

Appeared in Year: 2013

MCQ▾

Question

Across a first order phase transition, the free energy is –

Choices

Choice (4) Response

a.

Proportional to the temperature

b.

Such that the first derivative with respect to temperature is continuous

c.

A continuous function of the temperature but its derivative is discontinuous

d.

A discontinuous function of the temperature

Question number: 221

» Electromagnetic Theory » Solutions of Electrostatic and Magnetostatic Problems

Appeared in Year: 2011

MCQ▾

Question

A uniform surface current is flowing in the positive y direction over an infinite sheet lying in xy plane. The direction of the magnetic field is –

Choices

Choice (4) Response

a.

Along k^ for z>0 and along k^ for z<0

b.

Along k^ for z>0 and along k^ for z<0

c.

Along i^ for z>0 and along i^ for z<0

d.

Along i^ for z>0 and along i^ for z<0

Question number: 222

» Electromagnetic Theory » Interference

Appeared in Year: 2013

MCQ▾

Question

Interference fringes are seen at an observation plane z=0 , by the superposition of two plane waves A1exp[i(k1rωt)] and A2exp[i(k2rωt)] , where A1 and A2 are real amplitudes. The condition for interference maximum is –

Choices

Choice (4) Response

a.

(k1k2)r=(2m+1)π

b.

(k1+k2)r=2mπ

c.

(k1+k2)r=(2m+1)π

d.

(k1k2)r=2mπ

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