Question # 1

In the formula B= µ̻ nl, the symbol n denotes:

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Total number of turns of solenoid

Number of turns per unit length

Number of turns per unit volume

Numbers of turns per unit area

Number of moles

A resistance used in voltmeter is called

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shunt resistance

high resistance

low resistance

zero resistance

A shunt resistance parallel to the galvanometer is used to convert it into

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avometer

millimeter

voltmeter

none of these

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

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

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electric field

gravitational field

magnetic flax

magnetic field

The SI unit of magnetic induction is tesla which is equal to

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Newton/ampere-meter or N/A-m

Newton/ampere²-meter or N/A²-m

Newton/ampere²-meter² or N/A²-m²

Newton/ampere²-meter²or N/A²-m²

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

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Heating effect of current

Chemical effect of current

Magnetic effect of current

Electromagnetic effect of current

The CRO is used for displaying the waveform of a given

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current

voltage

both of them

none of them

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 SI unit of magnetic permeability is

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WB A^-1m^-1

WB mA^-1

WB Am^-1

None of these

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

Weber is a unit of

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magnetic flux

magnetic filed intensity

magnetic induction

magnetic flux density

The magnetic field inside a solenoid can be increased by:

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Increasing n

Decreasing I

Increasing I

By using iron core within solenoid

All correct except (B)

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

The SI unit of flux density is.

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Tesla

Weber

Gaun

Weber/meter

A voltmeter is used to measure the

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potential difference

current

temperature

resistance

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ECAT Physics Chapter 14 Electromagnetism Online Test MCQs With Answers

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