electromagnetic fields-1

Code No: 07A3EC04 Set No. 1 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

II B.Tech. I Sem., I Mid-Term Examinations, Aug./Sept. – 2009 ELECTROMAGNETIC FIELDS

Objective Exam Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20. A

I Choose the correct alternative: 1. In rectangular co-ordinate system the unit vectors are mutually _____ to each other.[ ] a. parallel b. perpendicular c. co-ordinate d. unit 2. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the

diagram.

Find the force acting in x- direction [ ]

a. 5N b. 3.5N c. 1N d. -1 N 3. ____ law states that the net electric flux passing through any closed surface is equal to the total

charge enclosed by that surface. a. equipotential b. Gauss c. point charge d. Maxwell’s [ ] 4. An electron is placed mid-way between two equal and opposite charges. The electron will a. be thrown out of field b. spin in the field c. remain stationary d. oscillate between the charges. [ ] 5. The electric field strength of a charge a. increases with distance b. decreases with distance c. decreases with square of distance d. decreases with cube of distance. [ ] 6. Which of the following is not a scalar field [ ] a) displacement of a mosquito in space b) high intensity in drawing room c) temperature distribution in your class room d) atmospheric pressure in agiven region. 7. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The

magnitude and direction of the Force on each charge is ________ [ ] a) 2 N directed away from each other b) 2.81N directed towards each other c) 2.81 N directed away from each other d) 2N towards each other

Cont…2

Code No: 07A3EC04 :2: Set No. 1

8. ________ is defined as the vector force on a unit positive test charge. [ ] a) potential b) electric field c) mmf d) Electric field intensity 9. If Curl of a vector field is zero, then that field is called as _______ field. [ ] a) Solenoidal b) irrotational c) point d) Gauss 10. The net outflow of flux per unit volume is called as the [ ] a) gradient b) divergence c) curl d) unit vector II Fill in the blanks 11. The volume charge density . Find 220vs = t .J∇ at 10 seconds? 12. The displacement current, Id =________ 13. __________ is defined as the ratio of permittivity of the dielectric to that of Free space 14. If 210 20 ,x zD x y u xy u s= + v = ________ at (1,1,0) 15. A scalar function, V is given by V=xy z2. The gradient of V. is ___________ 16. For steady currents the continuity equation is _________ 17. Capacitance offered by an Isolated sphere with radius r is _________ 18. For a spherical capacitor, the capacitance c is ___________ 19. If .D E∇⋅ =∈∇ and .J σ∇ = ∇.E

)∈ =

in a given material, the material is said to be _______and ________

20. The relaxation time of mica is _________ 15( 10 / , 6rmhos mσ −=

-oOo-





I Choose the correct alternative: 1. An electron is placed mid-way between two equal and opposite charges. The electron will a. be thrown out of field b. spin in the field c. remain stationary d. oscillate between the charges. [ ] 2. The electric field strength of a charge a. increases with distance b. decreases with distance c. decreases with square of distance d. decreases with cube of distance. [ ] 3. Which of the following is not a scalar field [ ] a) displacement of a mosquito in space b) high intensity in drawing room c) temperature distribution in your class room d) atmospheric pressure in agiven region. 4. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The

magnitude and direction of the Force on each charge is ________ [ ] a) 2 N directed away from each other b) 2.81N directed towards each other c) 2.81 N directed away from each other d) 2N towards each other 5. ________ is defined as the vector force on a unit positive test charge. [ ] a) potential b) electric field c) mmf d) Electric field intensity 6. If Curl of a vector field is zero, then that field is called as _______ field. [ ] a) Solenoidal b) irrotational c) point d) Gauss 7. The net outflow of flux per unit volume is called as the [ ] a) gradient b) divergence c) curl d) unit vector 8. In rectangular co-ordinate system the unit vectors are mutually _____ to each other. [ ] a. parallel b. perpendicular c. co-ordinate d. unit

Cont…2

Code No: 07A3EC04 :2: Set No. 2 9. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the

diagram.



charge enclosed by that surface. a. equipotential b. Gauss c. point charge d. Maxwell’s [ ] II Fill in the blanks 11. If 210 20 ,x zD x y u xy u s= + v = ________ at (1,1,0) 12. A scalar function, V is given by V=xy z2. The gradient of V. is ___________ 13. For steady currents the continuity equation is _________ 14. Capacitance offered by an Isolated sphere with radius r is _________ 15. For a spherical capacitor, the capacitance c is ___________ 16. If .D E∇⋅ =∈∇ and .J σ∇ = ∇.E

)∈ =

t


17. The relaxation time of mica is _________ 15( 10 / , 6rmhos mσ −= 18. The volume charge density . Find 220vs = .J∇ at 10 seconds? 19. The displacement current, Id =________ 20. __________ is defined as the ratio of permittivity of the dielectric to that of Free space

-oOo-

Code No: 07A3EC04 Set No. 3

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD II B.Tech. I Sem., I Mid-Term Examinations, Aug./Sept. – 2009

ELECTROMAGNETIC FIELDS Objective Exam

Name: ______________________________ Hall Ticket No.


I Choose the correct alternative: 1. Which of the following is not a scalar field [ ] a) displacement of a mosquito in space b) high intensity in drawing room c) temperature distribution in your class room d) atmospheric pressure in agiven region. 2. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The

magnitude and direction of the Force on each charge is ________ [ ] a) 2 N directed away from each other b) 2.81N directed towards each other c) 2.81 N directed away from each other d) 2N towards each other 3. ________ is defined as the vector force on a unit positive test charge. [ ] a) potential b) electric field c) mmf d) Electric field intensity 4. If Curl of a vector field is zero, then that field is called as _______ field. [ ] a) Solenoidal b) irrotational c) point d) Gauss 5. The net outflow of flux per unit volume is called as the [ ] a) gradient b) divergence c) curl d) unit vector 6. In rectangular co-ordinate system the unit vectors are mutually _____ to each other. [ ] a. parallel b. perpendicular c. co-ordinate d. unit 7. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the

diagram.



charge enclosed by that surface. a. equipotential b. Gauss c. point charge d. Maxwell’s [ ]

Cont…2

Code No: 07A3EC04 :2: Set No. 3 9. An electron is placed mid-way between two equal and opposite charges. The electron will a. be thrown out of field b. spin in the field c. remain stationary d. oscillate between the charges. [ ] 10. The electric field strength of a charge a. increases with distance b. decreases with distance c. decreases with square of distance d. decreases with cube of distance. [ ] II Fill in the blanks 11. For steady currents the continuity equation is _________ 12. Capacitance offered by an Isolated sphere with radius r is _________ 13. For a spherical capacitor, the capacitance c is ___________ 14. If .D E∇⋅ =∈∇ and .J σ∇ = ∇.E

)∈ =

t


15. The relaxation time of mica is _________ 15( 10 / , 6rmhos mσ −= 16. The volume charge density . Find 220vs = .J∇ at 10 seconds? 17. The displacement current, Id =________ 18. __________ is defined as the ratio of permittivity of the dielectric to that of Free space 19. If 210 20 ,x zD x y u xy u s= + v = ________ at (1,1,0) 20. A scalar function, V is given by V=xy z2. The gradient of V. is ___________

-oOo-





I Choose the correct alternative: 1. ________ is defined as the vector force on a unit positive test charge. [ ] a) potential b) electric field c) mmf d) Electric field intensity 2. If Curl of a vector field is zero, then that field is called as _______ field. [ ] a) Solenoidal b) irrotational c) point d) Gauss 3. The net outflow of flux per unit volume is called as the [ ] a) gradient b) divergence c) curl d) unit vector 4. In rectangular co-ordinate system the unit vectors are mutually _____ to each other. [ ] a. parallel b. perpendicular c. co-ordinate d. unit 5. F12 and F13 are two forces of 2 and 3 newtons. F13 maker an angle 30o with normal as shown in the

diagram.



charge enclosed by that surface. a. equipotential b. Gauss c. point charge d. Maxwell’s [ ] 7. An electron is placed mid-way between two equal and opposite charges. The electron will a. be thrown out of field b. spin in the field c. remain stationary d. oscillate between the charges. [ ] 8. The electric field strength of a charge a. increases with distance b. decreases with distance c. decreases with square of distance d. decreases with cube of distance. [ ]

Cont…2

Code No: 07A3EC04 :2: Set No. 4

9. Which of the following is not a scalar field [ ] a) displacement of a mosquito in space b) high intensity in drawing room c) temperature distribution in your class room d) atmospheric pressure in agiven region. 10. A point charge of 3x10-6 coulomb is 12cm from a second point charge of -1.5 x 10-6coulomb. The

magnitude and direction of the Force on each charge is ________ [ ] a) 2 N directed away from each other b) 2.81N directed towards each other c) 2.81 N directed away from each other d) 2N towards each other II Fill in the blanks 11. For a spherical capacitor, the capacitance c is ___________ 12. If .D E∇⋅ =∈∇ and .J σ∇ = ∇.E

)∈ =

t


13. The relaxation time of mica is _________ 15( 10 / , 6rmhos mσ −= 14. The volume charge density . Find 220vs = .J∇ at 10 seconds? 15. The displacement current, Id =________ 16. __________ is defined as the ratio of permittivity of the dielectric to that of Free space 17. If 210 20 ,x zD x y u xy u s= + v = ________ at (1,1,0) 18. A scalar function, V is given by V=xy z2. The gradient of V. is ___________ 19. For steady currents the continuity equation is _________ 20. Capacitance offered by an Isolated sphere with radius r is _________

-oOo-

electromagnetic fields-1

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