Regarding self-inductance:A: The self-inducta | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Analysis of the statements:$A:$ The self-inductance $L$ of a coil depends on its geometry (number of turns $N$,area $A$,length $l$). This is corre

Vedclass · Accepted Answer

$A, C, D, E$ only

Vedclass · Answer

(B) Analysis of the statements:$A:$ The self-inductance $L$ of a coil depends on its geometry (number of turns $N$,area $A$,length $l$). This is correct.$B:$ The self-inductance is given by $L = \mu N^2 A / l$,where $\mu = \mu_0 \mu_r$. Thus,it depends on the permeability of the medium. This statement is incorrect.$C:$ According to Lenz's Law,the self-induced e.m.f. opposes the change in current. This is correct.$D:$ In mechanics,mass represents inertia (resistance to change in velocity). In electromagnetism,self-inductance represents electrical inertia (resistance to change in current). This is correct.$E:$ To establish a current in an inductor,work must be done against the back e.m.f. to overcome the electrical inertia. This is correct.Therefore,statements $A, C, D,$ and $E$ are correct.

Similar Questions

The self-inductance $L$ of a solenoid of length $l$ and area of cross-section $A$ increases . . . . . . (Here with a fixed number of turns $N$).

Why is self-induced $emf$ known as back $emf$?

The current in self-inductance $L=40\; mH$ is to be increased uniformly from $1\; A$ to $11\; A$ in $4\; ms$. The $e.m.f.$ induced in the inductor during this process is ..... $V$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module