Responsibilities of British after getting the Deewani of Bengal:
The British East India Company was granted the Deewani of Bengal by the Mughal Emperor in 1765, which gave them the right to collect revenue in Bengal, Bihar, and Orissa. With this new responsibility, the British had several duties to fulfill in order to effectively govern the region.

Revenue Collection:
- One of the main responsibilities of the British after getting the Deewani was to efficiently collect revenue from the land. They had to ensure that taxes were collected fairly and that the revenue generated was enough to meet the expenses of administration.

Administration:
- The British had to establish a system of administration to govern the newly acquired territories. This included setting up courts, police stations, and other administrative structures to maintain law and order in the region.

Infrastructure Development:
- Another responsibility of the British was to invest in the development of infrastructure such as roads, bridges, and irrigation systems. This was essential for the economic growth of the region and to improve the quality of life for the local population.

Trade and Commerce:
- The British had to promote trade and commerce in the region to stimulate economic growth. They encouraged the production of cash crops such as indigo and opium, which were in high demand in Europe.

Social Welfare:
- The British also had a responsibility to look after the welfare of the people in the region. This included providing relief during times of famine, establishing schools and hospitals, and improving sanitation and public health.
In conclusion, after getting the Deewani of Bengal, the British had a range of responsibilities that included revenue collection, administration, infrastructure development, promoting trade and commerce, and social welfare. These responsibilities were crucial for the effective governance of the region and for the well-being of its inhabitants.