Question

when the company became diwan what impact it had on bengal economy.

Answer 1

After winning the battle of Buxar, British East India Company became diwan and Bengal was under the control of British.
The British took Diwani rights from Mughals and nizamat rights from Nawabs of Bengal. From Diwani rights, the British got the right to collect revenue from Bengal, Bihar and Orissa. The district of Kota and Allaha bad were taken from Nawabs of Awadh . The Mughal emperor granted the Northern Circars and became a pensioner under the British.
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Answer 2

Explanation:

The East India Company became the Diwan of Bengal, on 12 August 1765. As Diwan, the Company became the chief financial administrator of the territory under its control. The Company needed to administer the land and organize its revenue resources.