A box with two terminals is connected in...

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

`20 Omega` resistor

a strip of copper

a diode

a short length of fuse wire

Text Solution

Verified by Experts

The correct Answer is:

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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