Question # 1

The vector representation of force experience give the direction of

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magnetic field

current

length of conductor

force

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

The magnetic field in the middle of a solenoid due to current is

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weak

strong and uniform

none-uniform

zero

The CRO deflects the beam of electrons, when they passes through uniform

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electric field

gravitational field

magnetic flax

magnetic field

When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be

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changed

zero

unchanged

none of these

F = I(L x B) is a

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vector

scalar

unit vector

none of these

A solenoid is a coil of wire which is:

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Short, loosely wound, cylindrical

Long, tightly wound, spherical

Long, loosely wound, cylindrical

Long, tightly wound, cylindrical

None of these

A magnetic force on an electron travelling with 10⁸ms^-1parallel to a field of strength 1 Wb m^-2is

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Zero

10⁵m

10^-10N

10⁸N

The permeability of free space is measured in:

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Wb/Am

Wb A/m

Am/Wb

m/Web A

None of these

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

A galvanometer is an instrument used to

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measure voltage across a circuit

detect current in a circuit

measure current flowing through a circuit

none of these

The galvanometer can be made sensitive if the value of the factor C/BAN is

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constant

small

large

none of these

A long wire wound tightly on a cylindrical core is called:

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Potentiometer

Solenoid

Toroid

Wheat and stone bridge

None of these

The SI unit of flux density is

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Newton/Amp-meter

Newton-m/Ampere

Newton-m/Amp²

Newton-Amp/meter

A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is

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minimum

maximum

zero

none of these

The angle of deflection of coil can be measured by the

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one method

three method

two method

none of these

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ECAT Physics Chapter 14 Electromagnetism Online Test MCQs With Answers

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