Q27. The coercivity of a magnet is $5 \times 10 ^ { 3 } \mathrm {~A} / \mathrm { m }$. The amount of current required to be passed in a solenoid of length 30 cm and the number of turns 150 , so that the magnet gets demagnetised when inside the solenoid is\\
$\_\_\_\_$ A.