Question # 1

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

Galvanometer is a device used for the detection of

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voltage

current

temperature

pressure

The SI unit of magnetic induction is

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Gauses

Tesla

Weber

Weber²

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

The working of galvanometer depends upon torque exerted on a current carrying coil in

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magnetic field

electric field

gravitational field

nuclear field

In a moving coil galvanometer, the deflecting couple depends upon

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area of the coil

number of turns of coil

value of magnetic field

all of the above

To convert galvanometer into ammeter we connect

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small resistance in parallel with galvanometer

small resistance in series with galvanometer

high resistance in series with galvanometer

high resistance in parallel with galvanometer

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

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weak

strong and uniform

none-uniform

zero

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

Magnetic lines of force:

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Cannot intersect at all

Intersect at infinity

Intersect within magnet

Intersect at Neutral Point

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

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

Weber is a unit of

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magnetic flux

magnetic filed intensity

magnetic induction

magnetic flux density

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

Tesla is the unit of

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Magnetic induction or flux density

Magnetic flux

Self inductance

None of these

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

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