8. Electromagnetic waves Physics - 8. Electromagnetic waves

• ✓
  Displacement current of magnitude equal to / flows in the same direction as /
• B
  Displacement current of magnitude equal to / flows in a direction opposite to that of $I$
• C
  Displacement current of magnitude greater than / flows but can be in any direction
• D
  There is no current

Answer: A.

• A
  The energy density in electric field is equal to energy density in magnetic field
• B
  They travel with a speed equal to $\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$
• ✓
  They originate from charges moving with uniform speed
• D
  They are transverse in nature

Answer: C.

• A
  capacitive reactance remains constant.
• B
  capacitive reactance decreases.
• C
  displacement current increases.
• ✓
  displacement current decreases.

Answer: D.

• A
  $1.6 \times 10^{-6}\,T$
• B
  $1.6 \times 10^{-9}\,T$
• C
  $1.6 \times 10^{-8}\,T$
• ✓
  $1.6 \times 10^{-7}\,T$

Answer: D.

• A
  $3 \times 10^{-8} \cos \left(1.6 \times 10^3 x +48 \times 10^{10} t \right) \hat{ i }\,V / m$
• B
  $3 \times 10^{-8} \sin \left(1.6 \times 10^3 x +48 \times 10^{10} t \right) \hat{ i }\,V / m$
• C
  $9 \sin \left(1.6 \times 10^3 x -48 \times 10^{10} t \right) \hat{ k}\,V / m$
• ✓
  $9 \cos \left(1.6 \times 10^3 x +48 \times 10^{10} t \right) \hat{ k }\, V / m$

Answer: D.