# Q&A - Ask Doubts and Get Answers

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Engineering
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If an ammeter is to be used in place of a voltmeter, the we must connect with the ammeter a

• Option 1)

low resistance in parallel

• Option 2)

high resistance in parallel

• Option 3)

high resistance in series

• Option 4)

ow resistance in series

As we learnt  in  Moving coil galvanometer - It is a very sensitive instrument used to measure the small current.Galvanometer gives the deflection which is proportional to electric current flowing through it. - High resistance in series with a galvanometer converts it into a voltmeter. Option 1) low resistance in parallel Incorrect option Option 2) high resistance in parallel Incorrect...
Engineering
102 Views   |

If in a circular coil $A$ of radius $R$, current $I$ is flowing and in another coil $B$ of radius $2R$ a current $2I$ is flowing, then the ratio of the magnetic fields, $B_{A}$ and $B_{B}$ , produced by them will be

• Option 1)

1

• Option 2)

2

• Option 3)

1/2

• Option 4)

4

As we learnt in concept Magnetic Field due to circular coil at Centre -     Option 1) 1 Correct option Option 2) 2 Incorrect option Option 3) 1/2 Incorrect option Option 4) 4 Incorrect option
Engineering
124 Views   |

If an electron and a proton having same momenta enter perpendicular to a magnetic field, then

• Option 1)

curved path of electron and proton will be same ( ignoring the sense of revolution)

• Option 2)

they will move undeflected

• Option 3)

curved path of electron is more curved than that of the proton

• Option 4)

path of proton is more curved.

As we discussed in concept Radius of charged particle - -     will be same for electron and proton as , and are of same magnitude. Option 1) curved path of electron and proton will be same ( ignoring the sense of revolution) Correct option Option 2) they will move undeflected Incorrect option Option 3) curved path of electron is more curved than that of the proton Incorrect option Option...
Engineering
481 Views   |

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

• Option 1)

expand

• Option 2)

compress

• Option 3)

remains same

• Option 4)

none of these.

expand

Engineering
408 Views   |

The time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of its

• Option 1)

speed

• Option 2)

mass

• Option 3)

charge

• Option 4)

magnetic induction

As we discussed in Time period of charged particle - - wherein independent of speed of particle        is independent of speed. Option 1) speed Correct option Option 2) mass Incorrect option Option 3) charge Incorrect option Option 4) magnetic induction Incorrect option
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