Which of the following gives a reversible operation ?

Options

A. Multimeter shows an equal deflection in both case i.e. before and after reversing the robes if the chosen component is resistor
B. Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is capacitor
C. Multimeter shows a deflection, accompanied by a splash of light out of connected component in one direction and NO deflection on reversing the probes if the chosen component is LED
D. Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is metal wire

Answer

B

Explanation

(i) Multimeter shows deflection when it connects with capacitor.
(ii) If we assume that LED has negligible resistance then multimeter shows no deflection for the forward biased but when it connects in reverse direction, it break down occurs so splash of light out.
(iii) The resistance of metal wier may be taken zero, so no deflection in multimeter.
(iv) No matter, how we connect the resistance across multimeter, it shows some deflection.