Question

(a) Determine the transmission power $P$ of your cell phone. (This information is available online.) (b) A typical cell phone battery supplies a $1.5 \mathrm{~V}$ potential. If your phone battery supplies the power $P,$ what is a good estimate of the current supplied by the battery? (c) Estimate the width of your head. (d) Estimate the diameter of the phone speaker that goes next to your ear. Model the current in the speaker as a current loop with the same diameter as the speaker. Use these values to estimate the magnetic field generated by your phone midway between the ears when it is held near one ear. (e) How does your answer compare to the earth's field, which is about $50 \mu \mathrm{T} ?$

          (a) Determine the transmission power $P$ of your cell phone. (This information is available online.) (b) A typical cell phone battery supplies a $1.5 \mathrm{~V}$ potential. If your phone battery supplies the power $P,$ what is a good estimate of the current supplied by the battery?
(c) Estimate the width of your head.
(d) Estimate the diameter of the phone speaker that goes next to your ear. Model the current in the speaker as a current loop with the same diameter as the speaker. Use these values to estimate the magnetic field generated by your phone midway between the ears when it is held near one ear. (e) How does your answer compare to the earth's field, which is about $50 \mu \mathrm{T} ?$

Added by Brian V.

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