# The electromagnetic waves through a vacuum are described by:

1. E(x,t) = Em sin(ωt – kx), and
2. B(x,t) = Bm sin(ωt – kx)
3. then which relation is correct
1. Em k = Bm ω
2. Bm k = Em ω
3. Em Bm = ω k
4. Bm / Em = ω k

1. E × B
2. E × H
3. H × B
4. A × (B × E)

# Two parallel wires carrying current in the same direction:

1. Attract each other
2. Repel each other
3. Do not effect
4. None of the above

# Two parallel wires carrying current in the opposite direction:

1. Attract each other
2. Repel each other
3. Do not effect
4. None of the above