The voting, which began at 8 a.m. on a slow note at 257 polling stations, will continue till 5 p.m.
The counting will be taken up on November 12.
Though there are 12 candidates in fray, the main contest is between ruling Bharatiya Janata Party's Shankar Dayal Tripathi and his Congress rival Neelanshu Chaturvedi.
The seat fell vacant due to death of Congress MLA Prem Singh, who had won the seat in the last three elections.
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