Question
When the current i is flowing through a conductor, the drift velocity is v. If  2i  current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be(a) v/4(b) v/2(c) v  (d) 4v
       

Answer

(c) v  

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

$M_p$ denotes the mass of a proton and $M_n$  that of a neutron. A given nucleus, of binding energy $B,$ contains $Z$ protons and $N$ neutrons. The mass $M(N, Z)$ of the nucleus is given by $(c$ is the velocity of light$)$
If the sizes of charged bodies are very small compared to the distances between them, we treat them as ____________?
A small coil $C$ with $N = 200$ turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in figure. The cross sectional area of coil is $A= 1.0 \ cm^2,$ length of arm $OA$ of the balance beam is $l = 30 \ cm$. When there is no current in the coil the balance is in equilibrium. On passing a current $I = 22\ mA$ through the coil the equilibrium is restored by putting the additional counter weight of mass $\triangle m = 60\ mg$ on the balance pan. Find the magnetic induction at the spot where coil is located.
In the given figure each plate of capacitance $C$ has partial value of charge
An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the ac is 28 V. The r.m.s. secondary voltage is nearest to(a) 50 V(b) 70 V(c) 100 V (d) 40 V
       
An alternating current generator has an internal resistance $R_g$ and an internal reactance $X_g.$ It is used to supply power to a passive load consisting of a resistance $R_g$ and a reactance $X_L.$ For maximum power to be delivered from the generator to the load, the value of $X_L$ is equal to:
Value of refractive index for any medium is:
When the current changes from +2A to -2A in 0.05 second, an e.m.f. of 8V is induced in a coil. The coefficient of self-induction of the coil is:
Conventional flow of current will always be from:
A proton and an α -  particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 μ  sec to make 5 revolutions, then the periodic time for the α -  particle would be(a) 50 μ  sec(b) 25 μ sec(c) 10 μ  sec(d) 5 μ  sec