# GATE (Graduate Aptitude Test in Engineering) Physics: Questions 139 - 142 of 659

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## Question 139

Appeared in Year: *2012*

### Question

MCQ▾The electric and the magnetic fields and , respectively corresponding to the scalar potential and vector potential are –

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 140

Appeared in Year: *2012*

### Question

MCQ▾Two infinitely extended homogeneous isotropic dielectric media (medium – 1 and medium – 2 with dielectric constant and , respectively) meet at the plane as shown in the figure. A uniform electric field exists everywhere. For , the electric field is given by . The interface separating the two media is charge free. The electric displacement vector in the medium – 2 is given by,

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 141

Appeared in Year: *2012*

### Question

MCQ▾Deuteron has only one bound state with spin parity , isospin and electric quadrupole moment . These data suggest that the nuclear forces are having –

### Choices

Choice (4) | Response | |
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a. | Only spin and isospin dependence | |

b. | No spin dependence and no tensor components | |

c. | Spin dependence along with tensor components | |

d. | Spin dependence but no tensor components |

## Question 142

Appeared in Year: *2012*

### Question

MCQ▾The total energy, of an ideal non – relativistic Fermi gas in three in three dimensions is given by ; where, is the number of particles and V is the volume of the gas. Identify the correct equation of state (P being the pressure) –

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |