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qUESTIONS

Which of the following characteristics of electrons determines the current in a conductor.

A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by vPand vQ respectively, then

A beam contains 2 × 10^8 doubly charged positive ions per cubic centimeter, all of which are moving with a speed of 10^5m/s. The current density is

A cylindrical metal wire of length / and cross-sectional area S, has resistance R, conductance G, conductivity o and resistivity p. Which one of the following expressions for σ is valid

An electric cell of e.m.f. E is connected across a copper wire of diameter d and length 1. The drift velocity of electrons in the wire is vd. If the length of the wire is changed to 2L, the new drift velocity of electrons in the copper wire will be

MCQs-PYQs-12th-jee

The potential energy of a charged parallel plate capacitor is Uo. if a slab of dielectric constant k is inserted between the plates, then the new potential energy will be

MCQs-PYQs-12th-jee

An air-filled parallel plate capacitor has capacity C. If distance between plates is doubled and it is immersed in a liquid, then capacity becomes twice. Dielectric constant of the liquid is

MCQs-PYQs-12th-jee

A 500 µF capacitor is charged at a steady rate of 100 µC/second. The potential difference across the capacitor will be 10 V after an interval of

MCQs-PYQs-12th-jee

The potential to which a conductor is raised depends on

MCQs-PYQs-12th-jee

The electric intensity due to an infinite cylinder of radius R and having charge q per unit length at a distance r(r greater than R) from its axis is

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