If i am only trading in options and future in zerodha and there is no any share in my demate account. Will I still be charged account maintenance charges?
If this is the only demat account you are holding against your PAN and as the holdings value is under 50k, your account will considered as BSDA (Basic Services Demat Account). For BSDA accounts, there is no AMC applicable.
However, if you are holding another demat account, even if the holdings value is less than 50k, AMC will be applicable. You can learn more here: What is a Basic Services Demat Account (BSDA) and how can one be opened at Zerodha?