A constant current I maintained in a solenoid. Which of the follo… - Vidyadip

MCQ

A constant current $I$ maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the solenoid along its axis:-
$(a)$ Magnetic field at the centre
$(b)$ Magnetic flux linked with the solenoid
$(c)$ Self inductance of the solenoid
$(d)$ Rate of Joule heating

✓
$a, b, c$
B
$c, d$
C
$a, b$
D
Only $b$

✓

Answer

Correct option: A.

$a, b, c$

a
When ferro mag. material is inserted
$B \uparrow $ so ${\phi _B} \uparrow $ and $L \propto {\mu _r}$.

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