Which of the following quantities is not affected by a magnetic field?
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A stationary electric charge experiences no magnetic force.
The SI unit of the flux density is:
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Magnetic flux density can be expressed in tesla, Wb/m² and N/(A·m).
One Wb/m² is equal to:
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One tesla equals 10⁴ gauss.
A magnetic field:
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Magnetic force is produced when a charged particle has a velocity component perpendicular to the field.
A direct current flows through a metallic rod. The magnetic field produced due to it:
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A current-carrying conductor produces a magnetic field around and, for a finite conducting body, within it.
The phenomenon of production of magnetic field on passing an electric current in a straight conducting wire is based on the law of:
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Oersted demonstrated that electric current produces a magnetic field.
The permeability of free space, in Wb/Am, is:
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The permeability of free space is μ₀ = 4π × 10⁻⁷ Wb/(A·m).
A magnet needle is kept in a non-magnetic field. It experiences:
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In a uniform/non-magnetic field, there is no magnetic interaction producing force or torque.
Two free parallel wires carrying currents in opposite directions:
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Parallel currents in opposite directions repel each other.
Two streams of electrons moving parallel to each other in the same direction:
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Parallel electron streams correspond to parallel conventional currents and attract.
The magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called:
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For unit positive charge and unit velocity perpendicular to B, the magnetic force equals B.
Two free parallel wires carrying currents in same directions:
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Parallel currents in the same direction attract each other.
A magnetic compass will be deflected if it is kept near a:
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A moving charge produces a magnetic field that can affect a compass needle.
A moving charge produces:
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A moving charge has both electric and magnetic effects.
If a current is passed in a spring, it:
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Adjacent turns carrying current in the same direction attract, causing the spring to contract.
Moving electric charges will interact with:
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Moving charges are associated with electric and magnetic interactions.
Which of the following is scalar?
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Magnetic flux and emf are scalar quantities; magnetic flux density is a vector.
Magnetic flux and flux density are related by:
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For a uniform field normal to the surface, Φ = BA.
Which one of the following material is most suitable for making core of an electromagnet?
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Soft iron is easily magnetized and demagnetized, making it suitable for electromagnets.
Which one of the following relations is correct?
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Tesla, Wb/m² and N/(A·m) are equivalent units of magnetic flux density.
