141. If ill is the polarization vector and k is the direction of propagation of a plane electromagnetic wave, then
A. ? =
B. ii=
C. ii . i -0
D. ii x i =

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142. If the vector A and le are conservative, then
A. A x is solenoidal
B. A x B is conservative RI227c
C. A + B is solenoidal
D. A ?3 is solenoidal

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143. The value of dl along a circle of radius 2 units is
A. zero
B. 2it
C. 41t
D.27c

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144. A magnetic field B = (iix + 2iy - 4a) exists at a point. If a test charge moving with a velocity, = vo (3ax - y 2) experiences no force at a certain point, the electric field at that point will be
A. E. = -vo(35x - 25), + 4)
B. E =_v0(14? + 75z)
C. E=_--2-(14? -F 7a. )yz
D. E=-- (145. +7? )myz

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145. Consider the following statements associated with the basic electrostatic properties of ideal conductors I. The resultant field inside is zero 2. The net charge density in the interior is zero 3. Any net charge density in the interior is zero 4. The surface is always an equipotential 5. The field just outside is zero. Of these statements
A. 1,2, 3 and 4 are correct
B. 3, 4 and 5 are correct
C. 1, 2 and 3 are correct
D. 2 and 3 are correct

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146. Consider the following statements associated with the basic electrostatic properties of ideal conductors 1. Capacitance is proportional to area of plates 2. Capacitance is inversely proportinal to distance of separation of plates 3. The dielectric material is in a state of compression. Of these statements
A. 1, 2 and 3 are correct
B. 1 and 2 are correct
C. 1 and 3 are correct
D. 2 and 3 are correct

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147. When a lossy capacitor with a dielectric of permittivity E and conductivity a operates at a frequency co, the loss tangent for the capacitor is given by
A. c
B. (5a
C. ?W
D.E

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