An electrical galvanometer becomes more sensitive when
Correct answer: C. A small amount of current produces larger deflection.
- A. The area of its coil is made small.
- B. It converts into voltmeter and ammeter.
- C. A small amount of current produces larger deflection.
- D. A small amount of current produces smaller deflection.
Explanation
The correct answer is that a galvanometer becomes more sensitive when a small amount of current produces a larger deflection (Option C). This means that the instrument is capable of detecting smaller changes in current with greater precision. Option A is incorrect as making the coil area smaller does not necessarily increase sensitivity; rather, it is the deflection per unit current that matters. Option B is incorrect because converting a galvanometer into a voltmeter or ammeter involves adding additional components, which may actually decrease sensitivity. Option D is incorrect because smaller deflection for the same current indicates lower sensitivity.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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