Electric current is ..... ....

Electric current is ..... .

scalar quantity

vector quantity

derived quantity

simply a number

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The correct Answer is:

scalar quantity

Consider three conductors, meeting at junction p. Here when `I_(1) and I_(2)` currents combine at point P, they always give `I_(1) + l_(2) = I` Only irrespective of angle `theta`. It means that current is a scalar quantity.
Moreover , I = `(Q)/(t)` where charge Q and time t both are scalar. Hence current is also a scalar quantity.

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Threshold frequency for metal surface is 4xx10^(14) Hz.When radiation of 5xx10^(14) Hz is incident on this surface ,photo-electric current obtained is 1.8 mA.If frequency of incident radiation is made half and intensity is made three times,value of photo-electric current will be.....

0.9 mA

5.4 mA

3.6 mA

zero

Suppose [ epsilon_(0) ] is permittivity of free sapce. If M = mass, L = length, T = time and A = electric current, then.........

`|epsilon_(0)| = [M^(-1)L^(-3)T^(2)A]`

`|epsilon_(0)| = [M^(-1)L^(-3)T^(4)A^(2)]`

`|epsilon_(0)|= [M^(-1)L^(2)T^(-1)A^(-2)]`

Who had observed magnetic effect of electric current first ?

Oersted

Lorentz

Ampere

Bio-Savart