Moving Charges and Magnetism

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Moving Charges and Magnetism - 01

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Q1. According to oersted, around a current carrying conductor, magnetic field exists *

1 分

As long as there is current in the wire

Even after removing the current in the wire

Only few seconds after removing the current

None of them

Q2. *

1 分

Q3. Ampere’s circuital law is equivalent to *

1 分

Biot-Savart law

Kirchhoff’s law

Coulomb’s law

Faraday’s law

Q4. Biot-Savart law indicates that the moving electrons velocity(V) produce a magnetic field B such that *

1 分

B || V

B ⊥ V

it obeys inverse cube law

it is along the line joining electron and point of observation

Q5. Ampere’s circuital law is given by *

1 分

Q6. The magnetic field around a long straight current carrying wire is *

1 分

unsymmetrical

spherical symmetry

cylindrical symmetry

cubical symmetry

Q7. A current is passed through a straight wire. The magnetic field established around it has its lines of force *

1 分

Circular and endless

Oval in shape and endless

Straight

All of them

Q8. If a copper rod carries a direct current, the magnetic field associated with the current will be *

1 分

Both inside and outside the rod

Only inside the rod

Neither inside nor outside the rod

Only outside the rod

Q9. Magnetic field at the centre of a circular coil of radius r, through which a current I flows is *

1 分

directly proprotional to I^2

directly proportional to I

inverseley proportional to I

directly proportional to r

Q10. Magnetic field inside a solenoid is *

1 分

inversely porportional to current

directly proportional to its length

directly proportional to current

inversely proportional to total number of turns

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