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A long solenoid has circular cross section of radius R. The solenoid current is increasing, and as a result so is the magnetic field in the solenoid. The field strength is given by B = bt, where b is a constant.

http://session.masteringphysics.com/problemAsset/1036090/8/RW-27-34-1.jpg

Find an expression for the electric-field strength inside the solenoid a distance r from the axis.

Express your answer in terms of the variables B, r, R and t.

could anyone help me get started... i really have no clue on this one..

thanks !