An electrical cable of copper has just one wire of radius 9 mm. Its resistance is 5 ohm. This single copper wire of the cable is replaced by 6 different well insulated copper wires each of radius 3 mm. The total resistance of the cable will now be equal to ______.
[3] Current Electricity
Chapter: [3] Current Electricity
Concept: undefined >> undefined
In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is ______.
[3] Current Electricity
Chapter: [3] Current Electricity
Concept: undefined >> undefined
The example of non-ohmic resistance is ______.
[3] Current Electricity
Chapter: [3] Current Electricity
Concept: undefined >> undefined
Appliances based on heating effect of current work on ______.
[3] Current Electricity
Chapter: [3] Current Electricity
Concept: undefined >> undefined
A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be ______.
[4] Moving Charges and Magnetism
Chapter: [4] Moving Charges and Magnetism
Concept: undefined >> undefined
Which of the following is true?
[4] Moving Charges and Magnetism
Chapter: [4] Moving Charges and Magnetism
Concept: undefined >> undefined
Two free parallel wires carrying currents in the opposite directions ______.
[4] Moving Charges and Magnetism
Chapter: [4] Moving Charges and Magnetism
Concept: undefined >> undefined
The magnetic moment of a circular coil carrying current is ______.
[4] Moving Charges and Magnetism
Chapter: [4] Moving Charges and Magnetism
Concept: undefined >> undefined
Magnetic lines of force due to a bar magnet do not intersect because ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
A magnetic needle of magnetic moment 6.7 × 10–2 Am2 and moment of inertia 7.5 × 10–6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
Demagnetisation of magnets can be done by ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis. Of the following physical quantities the one which remains unchanged is ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
One can define ...A... of a place as the vertical plane which passes through the imaginary line joining the magnetic North and the South–poles. Here, A refers to ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
The ratio of intensity of magnetisation and magnetising field is called ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
Susceptibility is positive and large for a ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
If μ0 is absolute permeability of vacuum and μr is relative magnetic permeability of another medium, then permeability μ of the medium is ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
Which of the following is not correct about relative magnetic permeability (μ,)?
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
The magnetic susceptibility for diamagnetic materials is ______.
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
Among which of the following the magnetic susceptibility does not depend on the temperature?
[5] Magnetism and Matter
Chapter: [5] Magnetism and Matter
Concept: undefined >> undefined
The mutual inductance of a pair of coils is 0.75 H. If current in the primary coil changes from 0.5 A to zero in 0.01 s, find average induced e.m.f. in secondary coil ______.
[6] Electromagnetic Induction
Chapter: [6] Electromagnetic Induction
Concept: undefined >> undefined
