Which of the following statements are correct?
A. The algebraic sum of potential drops around any closed loop is zero.
B. Metals have high resistivity
C. The potentiometer is a device in which a condition of no current flow applies.
D. Kirchhoff's junction rule is based on conservation of charge
E. Bending the wire changes the validity of Kirchhoff's junction rule.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A, C and D only
(A) This is kirchoff's voltage law (KVL), which states that the sum of all potential drops and rises in closed loop is zero. It is based on principle of conservation of energy.
(C) In a potentiometer, the null deflection condition ensures that no current flows through the galvanometer branch, which is used to measure potential difference accurately.
(D) Kirchoff's Current law (KCL) states that the total current entering a junction equals the total current leaving the junction.