Electromagnetism

when a charged particle move s at right angle to a magnetic field then which of the following quantities change

when charged particle moves through magnetic field , the field changes its:

A beam of electrons and protons move parallel to each other in the same direction,they

it can be deduced that a piece of metal is already a magnetif

1 N. A-1. m-1 is equal to:

a current is passed through a straight wire. the magnetic field established around it has its lines of force

the current flowing towards the reader is represented by _____ sign

the direction of force on a current carrying conductor placed in a magnetic field is that of

magnetic lines of forces

which of the following is not affected by a magnetic field

the unit of magnetic induction is

resistance of ideal voltmeter is:

if a copper rod carries a direct current, the magnetic field associated with the current will be

direction of magnetic field due to the direction of current flowing away from reader in a conductor is:

charge to mass ratio of proton is:

If a current is passed through a spring then the spring will

the formula B=u(not) nI is used to find magnetic field

if there are n charge carriers per unit volume, then the number of charge carrires in a segment of wire of length L and area A is

accrdng to Faraday’s Law of electromagntc inductn

If a magnetic induction has a value of 10 Webers/m2 at a certain point in a magnetic field, the flux density is equal to:

A beam of electron is fired through axis of current carrying solenoid, the speed of electron will

velocity selector is a device in which a charged particle experiences an electric and a magnetic field acting

a movng galvanomtr has a coil of effctv field A nd no of turns N.the mgntc field B is radial.If currnt I is passd thrgh the coil,the torque actng on the coil is

in a movng galvanomtr the currnt I is relatd to the deflctn $ (note $=theta, @=proprtnality cnstant)

.a galvanomtr wid resistanc 5 Ohms can read upto 5mA.If this instrumnt is to be usd to read up to 100V,thn the value of resistanc to be usd in its series will be

multi-range voltmeter consists of a number of

To convrt a movng coil galvanomtr into voltmetr, the series high resistanc is givn by

in a stable galvanometer, the coil comes to rest

an ammetre

dead beat galvanometer is so called because it is

in televsn pctur tube the deflctn systm employs

couple necessary to produce unit twist is called

if the value of galvanometr cnstant K=C/BAN is made small,the galvanomtr can be made

the magntc forc on an elctrn travellng 10^8 m/s parallel to a field of strength 1 Wb/m^2 is

the crrnt passng through a coil of galvanometr is gvn by

the zero scale of an ohmmeter is marked at its

Faraday’s law of elctromgntc inductn is relatd to

when ohmmeter measures infinite resistance, its pointer lies at

in lamp and scale arrangement for measuring the angle of deflection, the scale is

after modifying galvanometer, we can make

in order to increase the range of an ammeter,the shunt resistanc is

the magntc flux producd at a point by a currnt carryng straight cndctr is givn by

the expressn fr magntc indctn inside a solenoid of length L,carryng a currnt I nd havng N turns is

the SI unit of magnetc permeability is

Two parallel wires carrying currents in the opposite directions

amperian path is a

the mgntc inductn due to a currnt i passd in a straight cndctr at a dstanc d frm it is proprtnal to

most meter movements give full scale deflection with a current of

whch of the followng relatns is corrct

the unit of E is NC-1 and that of B is NA-1m-1. the unit of E/B comes out to be

CRO works by deflecting the beam of electrons as they pass through

magnetic force

the direction of magnetic lines of forces around a current carrying wire is given by

A 5 meter wiere carrying a current of 2A is a right angles to the unifrom magnetic field of 0.5 webers/m2. the force on the wire is

CRO means

when a charged particle is projected in the direction of the field, then force experienced by it will be

the centripetal force expierienced by an electron which enters in a magnetic field is provided by

unit of evB is

when an electron is projected in a direction perpendicular to the lines of magnetic force, its path becomes a

a chargd particl movng in a magntc field experiences a resultant forc

the apparatus which makes the electronic trajectory visible uses

a proton entrs a magntc field of flux density 1.5 Wb/m2 wid a speed of 2*10^7 m/s at angle of 30 wid the field.the force on the proton will be

the strength of the magntc field due to a long straight condctr is
a.the same everywhr around the cndctr

a chargd particl movng wid a velcty v entrs a unifrm magntc field B.the partc experiences the largst deflctng forc whn the angl btwn v nd B is

a permanent magnt will not attrct

an elctrn moves wid speed 2*10^5 m/s along the postv x-dirctn in the presnc of a mgntc inductn B=i+4j-3k (in tesla).the magnitud of the forc experiencd by the elctrn in newtns is

field inside a solenoid is

which of the following particles would experience the largest magnetic force when projected with the same velocity perpendicular to magnetic field?

the magnetic flux density inside a hollow copper tube carrying current is :

strength of magnetic field is measured in SI units in

magnetic field is a

resistance of ideal galvanometer is:

a solenoid is a coil of wire which is

The force that appears as a result of the interaction b/w teo moving charges is known as :

in pivoted type galvanometer, a light pointer used to read the angle of deflection of the coil is made of

the displacement of the spot light on the scale is proportional to the angle of deflection provided the angle of deflection is