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Characteristic impedance of a transmission line is $50 \Omega$. Input impedance of the open-circuited line is $Z_{a^{-}}=100+j 150 \Omega$. When the transmission line is short- circuited, then value of the input impedance will be

1. $50 \Omega$
2. $100+j 150 \Omega$
3. $7.69+j 11.54 \Omega$
4. $7.69-j 11.54 \Omega$