フリー問題

問題文

An engineer wears the strap on the wrist and wonders how much of the charge it actually carries away. Which statement is correct?

選択肢

1. The strap drains the charge that has gathered on the skin and on clothing alike, so a board can be carried against a sleeve once the strap is worn and the bench is earthed.
2. The strap drains the charge that has gathered on the skin and leaves the charge that has gathered on clothing where it was, so a board carried against a sleeve is at risk even while the strap is worn.
3. The strap drains the charge that has gathered on clothing and leaves the charge that has gathered on the skin where it was, so a bare hand is at risk even once the room has been earthed.
4. The strap drains the charge that has gathered on the skin, and clothing holds too little charge to matter once the floor of the room has been earthed, for a bare hand and a gloved one alike.