Q153 / 160 · AP EAMCET 2021 (24 Aug Shift 2) · Physics

When a piece of a magnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material is

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • Correct answer
    D
    $4$

Solution

Let magnetic flux density outside $=B_0$ Magnetic flux density inside a magnetic material, $B=4 B_0$ We know that, $B=\mu_r B_o$ where, $\mu_r=$ Magnetic permeability of material $\Rightarrow \quad \mu_r=\frac{B}{B_0}=4$

Hence, the correct answer is option: 'D'.

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