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HPSC Prelims 2014GS-IIQ. 62 of 99
Q. 621 markMedium
HPSC Prelims 2014·GS-II
Electromagnetic waves consist of periodically oscillating electric and magnetic vectors:
(a)In randomly oriented planes but vibrating in phase
(b)In mutually perpendicular planes but vibrating in phase
(c)In mutually perpendicular planes but vibrating with a phase difference of π
(d)In mutually perpendicular planes but vibrating with a phase difference of π⁄2