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A box with two terminals is connected in series with a 2 V battery, an ammeter and a switch. When the switch is closed the needle of the ammeter moves

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A box with two terminals is connected in series with a 2 V battery, an ammeter and a switch. When the switch is closed the needle of the ammeter moves quickly across the scale and drops back to zero. The box contains
A. `20 Omega` resistor
B. a strip of copper
C. a diode
D. a short length of fuse wire
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Correct Answer - D
When a box contains fuse wire, a strong current flows through fuse when circuit is closed. Due to which a very strong heating effect takes place, resisting the breakage of fuse wire.
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