A circuit consists of a coil, a switch and a battery, all in series. The interval resistance of the battery is negligible compared with that of the coil. The switch is originally open. It is thrown closed, after a time interval Deltat. The current in the circuit reaches 80.0% of its final value. The switch then remainsclosed for a time interval much longer than Deltat. The wires connected to the terminals of the battery are then short circuited with another wire and removed from the battery, so that the current is uninterrupted. At an instant that is a time interval Deltat. After the short circuit, the current is what percentage of its maximum value?

A circuit consists of a coil, a switch and a battery, all in series. T

1.	A circuit consists of a coil, a switch and a battery, all in series. The interval resistance of the battery is negligible compared with that of the coil. The switch is originally open. It is thrown closed, after a time interval Deltat. The current in the circuit reaches 80.0% of its final value. The switch then remainsclosed for a time interval much longer than Deltat. The wires connected to the terminals of the battery are then short circuited with another wire and removed from the battery, so that the current is uninterrupted. At an instant that is a time interval Deltat. After the short circuit, the current is what percentage of its maximum value?
Answer» `20.0%` `8.0%` `4.0%` `10.0%` ANSWER :A

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