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CBSE

NEET Physics : Moving Charges And Magnetism

Multiple Choice Questions

61.

Two conducting circular loops of radii R₁ and R₂ are placed in the same plane with their centres coinciding. If R₁ > R₂, the mutual inductance M between them will be directly proportional to

$\frac{R_{1}}{R_{2}}$
$\frac{R_{2}}{R_{1}}$
$\frac{R_{1}^{2}}{R_{2}}$
$\frac{R_{2}^{2}}{R_{1}^{2}}$

62.

Assertion: A charged particle free to move in an electric field always moves along an electric field line.

Reason: The electric field lines diverge from a negative charge and converge at a positive charge.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

63.

Assertion: When a magnetic dipole is placed in a non uniform magnetic field, only a torque acts on the dipole.

Reason: Force would act on dipole if magnetic field is uniform.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false.

64.

The magnetic field at the centre O of the arc shown in the figure is

2 $I (\sqrt{2} + π) \times \frac{10^{- 7}}{r}$
2 $I (\sqrt{2} + \frac{π}{4}) \times \frac{10^{- 7}}{r}$
$I (\sqrt{2} + π) \times \frac{10^{- 7}}{r}$
$I (\sqrt{2} + \frac{π}{4}) \times \frac{10^{- 7}}{r}$

65.

Assertion: Magnetic field is useful in producing parallel beam of charged particle.

Reason: Magnetic field inhibits the motion of
charged particle moving across it.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

66.

Assertion: Acceleration of charged particle in non-uniform electric field does not depend on velocity of charged particle.

Reason: Charge is an invariant quantity. That is amount of charge on particle does not depend on frame of reference.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

67.

Two parallel long wires A and B carry currents i₁ and i₂ ( < i₂ ). When i₁ and i₂ are in the same direction, the magnetic field at a point mid way between the wires is 10 µT. If i₂ is reverse the field becomes 30 µT. The ratio i₁/ i₂

68.

What is the magnetic field on the axis of a coil of radius r carrying current I at a distance R from the origin?

$\frac{μ_{0} I r^{2}}{2 {(r^{2} + R^{2})}^{\frac{3}{2}}}$
$\frac{μ_{0} {IR}^{2}}{2 {(r^{2} + R^{2})}^{\frac{3}{2}}}$
$\frac{μ_{0} I}{2 (r + R)}$
$\frac{μ_{0} IR}{2 {(r^{2} + R^{2})}^{\frac{1}{2}}}$

69.

Assertion: If an electron and proton possessing same kinetic energy enter an electric field in a perpendicular direction, the path of the electron is more curved than that of the proton.

Reason: Electron forms a larger curve due to its small mass.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false.

70.

A long straight wire carries 10 A d.c. current an electron travels perpendicular to the plane of this wire at a distance 0.1 m with velocity 5.0 x 10⁶ ms^-1. Force acting on the electron due to current in wire is

zero N
0·6 × 10^-17 N
2.4 × 10^-17 N
2.2 × 10^-17 N

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NEET Physics : Moving Charges And Magnetism

Multiple Choice Questions