The electric field of electromagnetic wave E=10cos(107t±kx)j^ Amplitude =10 V/m∵c=kω∴3×108=k107 or k=301 or λ2π=301 or λ=188.4 m So, (1) and (3) option are correct.
The electric field of an electromagnetic wave in free space is given by E=10cos(107t+kx)j^V/m, where t and x are in seconds and metres respectively. It can be inferred that (1) The wavelength λ is 188.4 m. (2) The wave number k is 0.33rad/m. (3) The wave amplitude is 10 V/m. (4) The wave is propagating along.t x direction Which one of the following pairs of statements is correct?
Held on 30 Apr 2010 · Verified 9 Jul 2026.
(3) and (4)
(1) and (2)
(2) and (3)
(1) and (3)
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
Two point charges +2μC and -2μC are placed 10 cm apart. The electric field at the midpoint is:
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :- 
The electric potential at distance r from a point charge q is V = q/(4πε₀r). The electric field E is:
To an ac power supply of 220 V at 50 Hz , a resistor of $20 \Omega$, a capacitor of reactance $25 \Omega$ and an inductor of reactance $45 \Omega$ are connected is series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively-
A wire of resistance R is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the combination is :
Work through every NEET UG Electromagnetism PYQ, year by year.