Which of the following devices can be used to detect a weak current?

Use of electric bulb in tester.

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Use of LED in tester.

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A tester using magnetic effects of current.

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Both B and C

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Solution

The correct option is D Both B and C
LED glows even when a weak electric current flows through it. Also, even if the current is small, the deflection of the magnetic needle can be seen. Hence, a tester using LED or magnetic effects of current can be used to detect a weak current.
Hence Option D

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A tester to detect weak currents should use

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Which of the following devices can be used to detect a weak current?

The correct option is D Both B and CLED glows even when a weak electric current flows through it. Also, even if the current is small, the deflection of the magnetic needle can be seen. Hence, a tester using LED or magnetic effects of current can be used to detect a weak current. Hence Option D

The correct option is D Both B and C
LED glows even when a weak electric current flows through it. Also, even if the current is small, the deflection of the magnetic needle can be seen. Hence, a tester using LED or magnetic effects of current can be used to detect a weak current.
Hence Option D