A plane electromagnetic wave travels northward. At one instant, its electric field has a magnitude of 6.0 V/m and points eastward. What are the magnitude and direction of the magnetic field at this instant?

A radio station broadcasts at a frequency of 760 kHz. At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is $2.15 \times 10 ^ { - 11 } \mathrm { T }$. (a) What is the maximum electric field? (b) What is the wavelength of the electromagnetic wave?

If the Sun suddenly turned off, we would not know it until its light stopped coming. How long would that be, given that the Sun is $1.50 \times 10^{11}\ \mathrm{m}$ away?

At what distance does a 100-W lightbulb produce the same intensity of light as a 75-W lightbulb produces 10 m away? (Assume both have the same efficiency for converting electrical energy in the circuit into emitted electromagnetic energy.)

A step-up transformer connected to a 110-V line is used to supply a hydrogen-gas discharge tube with 5.0 kV (rms). The tube dissipates 75 W of power. (a) What is the ratio of the number of turns in the secondary winding to the number of turns in the primary winding? (b) What are the rms currents in the primary and secondary windings? (c) What is the effective resistance seen by the 110-V source?

The electric field of an electromagnetic wave traveling in vacuum is described by the following wave function: $\vec { \mathbf { E } } = ( 5.00 \mathrm { V } / \mathrm { m } ) \cos \left[ k x - \left( 6.00 \times 10 ^ { 9 } \mathrm { s } ^ { - 1 } \right) t + 0.40 \right] \hat { \mathbf { j } }$ where k is the wavenumber in rad/m, x is in m, t is in s. Find the following quantities: (a) amplitude (b) frequency (c) wavelength (d) the direction of the travel of the wave (e) the associated magnetic field wave

If you wish to detect details of the size of atoms (about 0.2 nm) with electromagnetic radiation, it must have a wavelength of about this size. (a) What is its frequency? (b) What type of electromagnetic radiation might this be?

The resonant frequency of an RLC series circuit is $2.0 \times 10 ^ { 3 } \mathrm { Hz }$. If the self-inductance in the circuit is 5.0 mH, what is the capacitance in the circuit?

The source is supplying the maximum power to the load when the load resistance equals the source resistance. (a) True (b) False

A long, straight wire carrying a current $I$ is next to a wire loop, with the straight wire lying in the plane of the loop (shown In the given figure). The current $I$ is increasing with time. What is the direction of the induced current in the loop, clockwise or countcrelockwise as viewed in the figure?

A certain 50.0-Hz AC power line radiates an electromagnetic wave having a maximum electric field strength of 13.0 kV/m. (a) What is the wavelength of this very low frequency electromagnetic wave? (b) What is its maximum magnetic field strength?

Lasers can be constructed to produce an extremely high-intensity electromagnetic wave for a short time, which is known as pulsed lasers. The electromagnetic wave produced have a maximum electric field of $2.5\times 10^{11} \,\text{V/m}$ for a brief time of $0.25\,\text{ns}$. Find the wave's maximum magnetic field strength?

A value of the correlation coefficient near 1 or near -1 implies a causal relationship between x and y .

An electromagnetic wave has a frequency of 12 MHz. What is its wavelength in vacuum?