Verified Solution • 2025–26 Session moderate

QJEEM20Ph996a: JEE Main 2020 Physics - Class 12 JEEM20Ph996a Solution: Which of the following will NOT be observed when a multimeter…

Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?

Multiple Choice Options

  • A Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is metal wire.
  • B 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.
  • C Multimeter shows an equal deflection in both cases i.e. before and after reversing the probes if the chosen component is resistor.
  • D Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is capacitor.

Step-by-Step Verified Solution

(1) Multimeter shows deflection when it connects with capacitor.

(2) If we assume that LED has negligible resistance then multimeter shows no deflection for the forward bias but when it connects in reverse direction, it break down occurs so splash of light out.

(3) The resistance of metal wire may be taken zero, so no deflection in multimeter.

(4) No matter, how we connect the resistance across multimeter. It shows same deflection.

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