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Fill in the blanks by choosing an approp...

Fill in the blanks by choosing an appropriate option.
An LED may be used in place of the electric bulb in the tester. LED glows even when a (i)____ electric current flows through it. There are two wires (called leads) attached to an LED. One lead is (ii)____ than other. When an LED is connected to a circuit, longer lead is always connected to the (iii)____ terminal of the battery and the shorter lead is connected to the (iv)_____ terminal of the battery.

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