Electromags removal

1. When two vectors are perpendicular, their

• Dot product is zero

• Cross product is zero

• Both are zero

• Both are not necessarily zero

Which of the following are not vector functions in Electromagnetics?

• There is non-vector functions in Electromagnetics

• Gradient

• Curl

• Divergence

The work done of vectors force F and distance d, separated by

• Cross product

• Addition of two vectors

• Cannot be calculated

• Dot product

Which of the following is not true?

• (B . C) = Scalar value

• A x (B x C)= scalar value

• A x (B . C)= scalar value

• A x (B x C) = vector value

A unit normal vector to the cone ∅=30° is:

• a. ar

• B. a∅

• c. aø

• d. None of these

For conductors, the free electrons will exist at

• a. Valence band

• b. Middle of valence and conduction band

• c. Will not exist

• D. Conduction band

What is the relationship between electric field and potential gradient?

• A. The electric field is the negative gradient of the electric potential

• b. the magnitude of electric field is the minimum value of rate of charge of potential with distance.

• c. The direction of electric field is the same to the direction in which the potential is increasing most

  rapidly

• d. None of the above

Gauss's Law cannot be applied in

• a. Hollow sphere

• b. Solid sphere

• c. Cube

• D. Unbounded surface

Gradient of scalar field is expressed as

• A. Outward flux of a vector field per unit volume as the volume about the point

  tends to zero.

• b. Gradient of divergence of a vector field minus the curl of the vector field.

  .

• c. Circulation of a vector field per unit area as the area tends to zero.

• d. Maximum rate of increase of scalar function at appoint

The electric field E, current density J and conductivity o of a conductor are related as

• a. ó= E/j

• B. ó= j/E

• c. ó = jE

• d. ó= 1/jE