Two wires carrying from Physics Moving Charges And Magnetism

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 Multiple Choice QuestionsMultiple Choice Questions

231.

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


232.

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.


233.

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.


234.

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.


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235.

A wire of mass 100 g, length 1 m and current 5 A is balanced in mid air by a magnetic field B, then find the value of B

  • 0.2 T

  • 0.1 T

  • 0.5 T

  • 0.6 T


236.

A toroid with mean radius r0, diameter 2a have turns carrying current I. What is the magnetic field B outside the toroid?

  • N I2πr0

  • NI2π r0 + a

  • NIπr0 + a

  • zero


237.

Identify incorrect for electric charge q

  • quantised

  • conserved

  • additive

  • non-transferable


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238.

Two wires carrying

  • Parallel current repel each other.

  • Antiparallel current attract each other.

  • Antiparallel current repel each other.

  • Equal magnitudes of antiparallel current attract each other.


C.

Antiparallel current repel each other.

Two parallel current carrying wires in the same direction attract each other whereas two parallel current carrying wires in the opposite direction repel each other.


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239.

Electric field outside a long wire carrying charge q is proportional to

  • 1r

  • 1r2

  • 1r35

  • 1r32


240.

Assertion:  A planar circular loop of area A and carrying current I is equivalent to magnetic dipole of dipole moment M = IA.

Reason: At large distances, magnetic field of circular loop and magnetic dipole is same.

  • 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.


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