Question

(i) A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the

solenoid:

(a) will become zero (b) will increase (c) will decrease (d) will remain unaffected

(ii) Magnetic lines of force inside current carrying solenoid are :

(a) perpendicular to axis

(b) along the axis and parallel to each other

(c) parallel inside the solenoid and circular at the ends.

(d) circular

(iii) The factors on which magnetic field strength produced by current carrying solenoid

depends are :

(a) Magnitude of current. (b) Number of turns

(c) Nature of core material. (d) All of the above.

(iv) The strength of magnetic field inside a long current carrying straight solenoid is :

(a) more at the ends than at the centre. (b) minimum in the middle

(c) same at all points (d) found to increase from one end to the other.

(v) What should be the material of core of an electromagnet ?

(a) soft iron (b) hard iron (c) rusted iron (d) none of above​

Answer 1

Answer:

depends are :

(a) Magnitude of current. (b) Number of turns

(c) Nature of core material. (d) All of the above.

(iv) The strength of magnetic field inside a long current carrying straight solenoid is :

(a)

) minim.um in the mi.ddle

(c

Explanation:

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