## The horizontal component of earth’s magnetic field at place is 0.36× 10^-4 weber/m². If the angle of dip at that placed is…..

Q. The horizontal component of earth’s magnetic field at place is 0.36× 10-4 weber/m². If the angle of dip at that placed is 60° then the value of vertical component of earth’s magnetic field will be (in wb/m²)

(a) 6 × 10-5 T

(b) 6√2 × 10-5 T

(c) 3.6√3 × 10-5 T

(d) √2 × 10-5 T

Ans:(c)

## A magnetic material of volume 30cm³ is placed in a magnetic field of intensity 5 oersted. The magnetic moment produced…..

Q. A magnetic material of volume 30cm³ is placed in a magnetic field of intensity 5 oersted. The magnetic moment produced due it is 6 amp – m². The value of magnetic induction will be.

(a) 0.2517 Tesla

(b) 0.025 Tesla

(c) 0.0025 Tesla

(d) 25 Tesla

Ans: (a)

## A rod of ferromagnetic material with dimensions 10cm×5cm× 2cm is placed in a magnetising field of intensity 2 × 10^-5 A/m…..

Q. A rod of ferromagnetic material with dimensions 10cm ×5cm × 2cm is placed in a magnetising field of intensity 2 × 10-5 A/m. The magnetic moment produced due it is 6 amp – m². The value of magnetic induction will be …….10-2T.

(a) 100.48

(b) 200.28

(c) 50.24

(d) 300.48

Ans:(a)

## Find the percentage increase in the magnetic field B when the space within the current carrying toroid is filled with aluminum….

Q. Find the percentage increase in the magnetic field B when the space within the current carrying toroid is filled with aluminum. The susceptibility of aluminium is 2.1 × 10-5

(a) 3.1 × 10-3

(b) 1.1 × 10-3

(c) 2.1 × 10-3

(d) 2.1 × 10-5

Ans: (c)

## 300 turns of a thin wire are uniformly wound on a permanent magnet shaped as a cylinder of length 15cm….

Q. 300 turns of a thin wire are uniformly wound on a permanent magnet shaped as a cylinder of length 15cm. When a current 3A is passed through the wire, the field outside the magnet disappears. Then the coercive force of the material is

(a) 2 kNm-1

(b) 4 kNm-1

(c) 5 kNm-1

(d) 6 kNm-1

Ans : (a)