Calculate the charge density in a certain region, in the following two cases:
the electric field in spherical coordinates is given by:
e(r)=ar^2 r+bcosθ/r θ+cϕ
where a, b and c are constants
the electric field in cylindrical coordinates is given by:
er=a/rr+br θ+cr^2z^2z
where a, b and c are constants

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

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because growing process had stoped after 4-5 year