SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

The electric field of a plane polarized electromagnetic wave in free space at time t=0 is given by an expression (x, y) = 10 cos [(6x+8z)] The magnetic field  (x, z, t) is given by :(c is the velocity of light)

(a)

= (6+8)cos [(6x−8z+10ct)]

(b)

(6−8)cos[(6x+8z−10ct)]

(c)

(6+8)cos[(6x+8z−10ct)]

(d)

(6−8)cos[(6x+8z+10ct)]


Question ID - 50259 :-

The electric field of a plane polarized electromagnetic wave in free space at time t=0 is given by an expression (x, y) = 10 cos [(6x+8z)] The magnetic field  (x, z, t) is given by :(c is the velocity of light)

(a)

= (6+8)cos [(6x−8z+10ct)]

(b)

(6−8)cos[(6x+8z−10ct)]

(c)

(6+8)cos[(6x+8z−10ct)]

(d)

(6−8)cos[(6x+8z+10ct)]

1 Answer
5876 Votes
3537

Answer Key : (b) -

=10 cos [(6+8). (x+z)]

=10 cos []

=6+8; direction of waves travel.

i.e. direction of ‘c’.

∴ Direction of  will be along

×=

Mag. of  will be along ×=

Mag. of  ==

==



Next Question :

Consider the nuclear fission Ne20→2He4+C12 Given that the binding energy/nucleon of Ne20, He4 and c12 are, respectively, 8.03 MeV, 7.07 MeV and 7.86 MeV, identify the correct statement:

(a)

8.3 MeV energy will be released

(b)

Energy of 12.4MeV will be Supplied

(c)

Energy of 11.9 MeV has to be supplied

(d)

Energy of 3.6 MeV will be released


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