Question

Problem 1. ( 15 pt) Circle only one answer. Each correct answer adds 5pt, a wrong answer

subtracts 1pt,

1. (5pt) a) b) c) d) e)

2. (5pt) a) b) c) d) e)

3. (5pt) a) b) c)

   d) e) f)

no answer gives 0 pt.

For any parallel plate capacitor, the following is true
the field is zero outside of the plates, except for the edges the field is constant inside
the field changes linearly with distance inside

none of the above both a) and b)

The electric dipole
is a system of two opposite charges that generates electric potential
is a system of two charges that generates electric field but not potential

is introduced to describe interaction of two charges in free space

none of the above both a) and b)

For any static magnetic field, H the following is true
it is measured in Wb
it is introduced to facilitate calculation of B-field in nonmagnetic medium

∫ r r gives the amount of current flowing through area S .

H ⋅ dl C

c

all of the above both b) and c) both a) and c)

Problem 1. (15 pt) Circle only one answer. Each correct answer adds 5pt, a wrong answer subtracts lpt, no answer gives 0 pt. (5pt) For any parallel plate capacitor, the following is true a) the field is zero outside of the plates, except for the edges b) the field is constant inside c) the field changes linearly with distance inside d) none of the above e) both a) and b) 2. (5pt) The electric dipole a) is a system of two opposite charges that generates electric potential b) is a system of two charges that generates electric field but not potential c) is introduced to describe interaction of two charges in free space d) none of the above e) both a) and b) 3. (5pt) For any static magnetic field, H the following is true a) it is measured in Wb b) it is introduced to facilitate calculation of B-field in nonmagnetic medium c) $Ādi gives the amount of current flowing through area Sc. d) all of the above e) both b) and c) f) both a) and c)

Answer 1

1) For parallel plate capacitor the field is zero outside of the plate, except of the edges and the field is constant inside

2) The electric dipole is a system of two opposite charges that generates electric potential.

3)For any static magnetic field , H it is introduced to facilitate calcultion of B field in non magnetic medium and H.dl gives the amount of current flowing through area Sc.

Answer 2

1. Consider the parallel plate capacitor as shown in Figure. E=0 E=0 The electric field due to the positive charged plate is: Away from the plate. The electric field due to the negative charged plate is: Towards the plate. Now, refer the figure, the electric field outside the plate will be equal to zero because electric field due to positive and negative charged plate will cancel out each other. The electric field inside the plate which are separated by the distance d is, (1) .... .. + + + + + + + + +

The electric field inside the plate is constant and does not depend upon the distance (as shown in equation 1). Hence, the correct option is (e). 2. The electric dipole is an arrangement of two equal and opposite charges separated by a finite distance. The electric potential due to an electric dipole is, 1 p cos 0 4лео The electric field due to an electric dipole is, E = 4πες (r+ α). 3/2 Hence, an electric dipole generates both the electric field and the potential. Therefore, the correct option is (a).

3. Wb is the SI unit of magnetic flux. The unit of the magnetic field intensity H is ampere-turns per meter (At/m). For any static magnetic field, H is introduced to facilitate calculation of B-field in nonmagnetic medium. According to ampere circuital law. the relation between the current and the magnetic field can be explained. The integral of magnetic field intensity (H) in a closed path S. is equal to the current enclosed by the path. фн d-1 Hence, the correct option is (e).|