# General Science/Basic Science physics Tangent Law And Galvanometer Sample Test,Sample questions

1.zero

2.0.1 Wb

3.1 Wb

4.10 Wb

## Question: `A current of 1.5A flows through the coil of 5 turns of a tangent galvanometer having a diameter 0.3m. If the deflection of the needle at its centre is 45� then the horizontal intensity of earths field at that place is`

1.250 A-turn/m250 A-turn/m

2.25 A-turn/m

3.2.5 A-turn/m

4.2500 A-turn/m

1.2A

2.1.5A

3.3A

4.4A

## Question: `A magnetic needle suspended at a place having two magnetic fields comes to rest when`

1.two fields are at right angle

2.one of the field coincides with earths magnetic field

3.couples acting on the needle are equal and opposite

4.the needle is around 45�

## Question: `A tangent galvanometer is an absolute instrument because`

1.it uses a small magnetic needle

2.it measures earths magnetic field

3.it is sensitive around 45�

4.it does not take the help of other instruments for calibration

1.B

2.tan ?

3.B tan ?

4.None of them

## Question: `During the initial adjustment the magnetic needle of the deflection magnetometer in Tan B position`

1.position East � West direction

2.is perpendicular to magnetic meridian

3.points North � South direction

4.shows 0-0 on the graduated scale

## Question: `During the initial adjustment the pointer of the deflection magnetometer in TanA position.`

1.points East � West direction

2.points North � South direction

3.is perpendicular to magnetic meridian

4.is along the arms

## Question: `For a short magnet placed along the arms of deflection magnetometer in TanA position`

1.2M/d3 tan ? ? 10-7 = B

2.M/B ? 107 = d3 tan ?

3.M = d3 B tan ? ? 107

4.M/B = d3/2 . tan ? ? 107

## Question: `For a short placed across the arms of deflection magnetometer in tan B position`

1.M/B = d3/2 .tan ? ? 107

2.M/B = 10-7 d3 tan ?

3.M/B = d3 tan ? ? 107

4.M/B = 10-7.d3/2 .tan ?

1.4:00 AM

2.40 A

3.0.4 A

4.400 A

1.400mA

2.520A

3.450A

4.520mA

1.H = n I/2r2

2.H = n I/2r

3.H = 2r/n I

4.H = n I/2

1.1.1

2.1.72

3.5.1732

4.1.732

## Question: `In Tan A position of equal distance method of comparing the magnetic moments of bar magnets the ratio of their moments is given by`

1.M1/M2 = (d2+l12)2 tan ?1/ (d2+l22)2 tan ?2

2.M1/M2 = (d2+l12)3/2 tan ?1/ (d2+l22)3/2 tan ?2

3.M1/M2 = (d2-l12)2 tan ?1/ (d2-l22)2 tan ?2

4.M1/M2 = (d2-l12)3/2 tan ?1/ (d2-l22)3/2 tan ?2

## Question: `In Tan A position of null deflection method of comparing the magnetic moments of bar magnets the ratio of their moments is given by`

1.M1/M2 = (d12-l12)2 d2/ (d12-l22)2 d1

2.M1/M2 = (d12-l12)2 d1/ (d12-l22)2 d2

3.M1/M2 = (d12+l12)2 d1/ (d12+l22)2 d2

4.M1/M2 = (d12+l12)2 d2/ (d22-l22)2 d1

## Question: `In Tan B position of equal distance method of comparing magnetic moments of bar magnets the ratio of their moments is given be`

1.M1/M2 = (d2+l22)3/2 tan ?1/ (d2+l12)3/2 tan ?2

2.M1/M2 = (d2+l12)3/2 tan ?1/ (d2+l22)3/2 tan ?2

3.M1/M2 = (d2-l12)2 tan ?1/ (d2+l22)2 tan ?2

4.M1/M2 = (d2+l12)2 tan ?1/ (d2+l22)2 tan ?2

## Question: `In Tan B position of null deflection method of comparing the magnetic moments of bar magnets the ratio of their moments is given by`

1.M1/M2 = (d12+l12)3/2/ (d22+l22)3/2

2.M1/M2 = (d12-l12)3/2/ (d22-l22)3/2

3.M1/M2 = (d22+l22)3/2/ (d12+l12)3/2

4.M1/M2 = (d22-l22)3/2/ (d12-l12)3/2

## Question: `In TanA position the arms of the magnetometer are kept`

1.parallel to the magnetic meridian

2.along the magnetic meridian

3.perpendicular to the magnetic meridian

4.along the equator

## Question: `In tangent galvanometer experiment the plane of the coil should be adjusted to be along the`

1.magnetic axis

2.equator

3.magnetic meridian

4.East-West direction

## Question: `Magnetic intensity due to a bar magnet of length 2l and pole strength m at an equatorial point at a distance d from the mid-point is`

1.�0/4? . Md/(d2+l2 )3/2

2.�0/4? . 2Md/(d2+l2 )3/2

3.�0/4? . M/(d2+l2 )3/2 parallel to axis directed N ?S

4.�0/4? . M/(d2+l2 )3/2 parallel to axis directed S ?N

## Question: `Plane of the tangent galvanometer is set along the magnetic meridian because in that case the field due to current is`

1.zero

2.parallel to the magnetic meridian

3.perpendicular to the magnetic meridian

4.infinity

## Question: `Tangent galvanometer works on the principle of`

1.Biot-Savarts law

2.Amperes law

3.Coulombs law

4.Tangent law

## Question: `Tangent law is used`

1.when two uniform and mutually perpendicular magnetic fields are present

2.when two uniform and parallel magnetic fields are present

3.when two magnetic fields are present

4.when horizontal component of the earths magnetic field is present

## Question: `The circular compass box of a tangent galvanometer has graduations`

1.from 0 to 360�

2.from 0� to 180�

3.from 0� to 90�

4.from 0� to 45�

## Question: `The deflection magnetometer is constructed such that the centre of the magnetic needle`

1.is at the centre of the compass box

2.is at the centre of the plate form

3.is at the centre of the magnetic meridian

4.coinides with the zeros of the graduations an the arms

## Question: `The deflection magnetometer works on the principle of`

1.Coulombs law

2.Biot-savart law

3.Tangent law

4.Ampere law

1.1:02

2.2:01

3.3:01

4.1:03

## Question: `The field at the centre of a coil of radius 16 cm having 10 turns and carrying a current of 8 A is`

1.25 A-turns/m

2.2.5 A-turns/m

3.80?10-2 A-turns/m

## Question: `The magnetic field along the axis of a bar magnet is`

1.B = �0/4? . 2Md/(d2-l2)3/2

2.B = �0/4? . M/(d2+l2)3/2

3.B = �0/4? . 2Md/(d2-l2)2

4.B = �0/4? . M/(d2+l2)2

## Question: `The magnetic needle of a tangent galvanometer is kept small because the magnetic field is`

1.very small

2.very large

3.considered to be uniform over a small area

4.such that it is convenient to handle small needle

## Question: `The plane of the compass box of a tangent galvanometer is`

1.along the magnetic meridian

2.parallel to the turn table

3.parallel to the plane of the coil

4.vertical

1.2nHh

2.2Hh/r

3.2rHh/n

4.2nrHh

1.0�

2.30�

3.90�

4.45�

## Question: `The tangent galvanometer is used to determine`

1.potential difference

2.deflection

3.resistance

4.current

## Question: `the two turn coil of a tangent galvanometer`

1.is used to produce a magnetic field

2.is used to measure currents of low value

3.is used to measure currents of high value