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Magnetic Effect of Current JEE physics - Magnetic Effect of Current

CBSE - STD 12 Science - JEE physics (CBSE - English Medium). 364 questions in this chapter.

Question types

Magnetic Effect of Current question types

364 questions across 1 question group — pick any mix to generate a JEE physics paper with step-by-step answer keys.

364
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1
Question groups
5
Question types
Sample Questions

Magnetic Effect of Current questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
In a uniform magnetic field of $0.049 \mathrm{~T}$, a magnetic needle performs $20$ complete oscillations in $5$ seconds as shown. The moment of inertia of the needle is $9.8 \times 10^{-5} \mathrm{~kg} \mathrm{~m}^2$. If the magnitude of magnetic moment of the needle is $x \times 10^{-5} \mathrm{Am}^2$, then the value of ' $x$ ' is :
  • A
    $128 \pi^2$
  • B
    $50 \pi^2$
  • C
    $1280 \pi^2$
  • D
    $5 \pi^2$
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Q 2MCQ1 Mark
A uniform conducting wire of length $12 \mathrm{a}$ and resistance $'R'$ is wound up as a current carrying coil in the shape of,

$(i)$ an equilateral triangle of side $'a'.$

$(ii)$ a square of side $'a'.$

The magnetic dipole moments of the coil in each case respectively are:

  • A
    $\sqrt{3} \mathrm{Ia}^{2}$ and $3 \mathrm{Ia}^{2}$
  • B
    $3 \mathrm{Ia}^{2}$ and $\mathrm{Ia}^{2}$
  • C
    $3 \mathrm{Ia}^{2}$ and $4 \mathrm{Ia}^{2}$
  • D
    $4 \mathrm{Ia}^{2}$ and $3 \mathrm{Ia}^{2}$
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Q 3MCQ1 Mark
A wire of length $L$ metre carrying a current of $I$ ampere is bent in the form of circle. Its magnetic moment is
  • A
    $\frac{I L^{2}}{4 \pi} A \;m^{2}$
  • B
    $\frac{I L^{2}}{4} A \;m^{2}$
  • C
    $\frac{I \pi L^{2}}{4} A \;m^{2}$
  • D
    $\frac{2 I L^{2}}{\pi} A \;m^{2}$
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Q 4MCQ1 Mark
Current sensitivity of a moving coil galvanometer is $5\,div/mA$ and its voltage sensitivity (angular deflection per unit voltage applied) is $20\,div/V$. The resistance of the galvanometer is ................. $\Omega$
  • A
    $40$
  • B
    $25$
  • C
    $500$
  • D
    $ 250$
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Q 5MCQ1 Mark
A uniform magnetic field of $0.3\; T$ is established along the positive $Z$ -direction. A rectangular loop in $XY$ plane of sides $10 \;cm$ and $5 \;cm$ carries a current of $I =12\; A$ as shown. The torque on the loop is
  • A
    $-1.8 \times 10^{-2}$$\hat j\;Nm$
  • B
    $0$
  • C
    $-1.8 \times 10^{-2}$ $\hat i\;Nm$
  • D
    $+1.8 \times 10^{-2}$ $\hat i\;Nm$
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