A current of 5 A passes through a copper conductor (resistivity $= 1.7 \times 10 ^ { - 8 } \Omega \mathrm {~m}$) of radius of cross-section 5 mm. Find the mobility of the charges if their drift velocity is $1.1 \times 10 ^ { - 3 } \mathrm {~ms} ^ { - 1 }$.\\
(1) $1.5 \mathrm {~m} ^ { 2 } \mathrm {~V} ^ { - 1 } \mathrm {~s} ^ { - 1 }$\\
(2) $1.8 \mathrm {~m} ^ { 2 } \mathrm {~V} ^ { - 1 } \mathrm {~s} ^ { - 1 }$\\
(3) $1.0 \mathrm {~m} ^ { 2 } \mathrm {~V} ^ { - 1 } \mathrm {~s} ^ { - 1 }$\\
(4) $1.3 \mathrm {~m} ^ { 2 } \mathrm {~V} ^ { - 1 } \mathrm {~s} ^ { - 1 }$