how many rings does this planet have?
13
Rings of Uranus
By 1978, nine distinct rings were identified. Two additional rings were discovered in 1986 in images taken by the "Voyager 2" spacecraft, and two outer rings were found in 2003–2005 in Hubble Space Telescope photos. In the order of increasing distance from the planet the 13 known rings are designated 1986U2R/ζ, 6, 5, 4, α, β, η, γ, δ, λ, ε, ν and μ. 
what is rings of uranus? Are intermediate in complexity between the more extensive set around Saturn and the simpler systems around Jupiter and Neptune.
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Rings of Uranus [SEP] Introduction
The ring system contains little dust overall; it consists mostly of large bodies 20 cm to 20 m in diameter. Some rings are optically thin: the broad and faint 1986U2R/ζ, μ and ν rings are made of small dust particles, while the narrow and faint λ ring also contains larger bodies. The relative lack of dust in the ring system may be due to aerodynamic drag from the extended Uranian exosphere.