Choose the correct statements from following:
A. Resistivity of a conductor increases with increase in its length.
B. When a small resistor is connected in parallel across a galvanometer, it is converted into ammeter.
C. Current density is a vector quantity.
D. Potentiometer is used to measure the electric current.
E. Kirchoff's junction rule is based on the conservation of charge.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → B, C & E only
(E) Yes, Kirchoff's junction rule is based on conservation of charge as current is always constant in circuit.
(B) Yes, A galvanometer can be converted into ammeter, when a low resistance called a shunt is connected parallel to it.
(C) Yes, current density a is a vector quantity as it has both magnitude and direction. The direction of current density is the same as direction of charge at that point.