- A$\frac{1}{\sqrt{\mu_r \in_r}}$
- B$\sqrt{\mu_r / \in_r}$
- C$\sqrt{\in_r / \mu_r}$
- ✓$\sqrt{\mu_r \in_r}$
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A long straight wire carries a current of π amp. The magnetic field due to it will be 5
at what distance from the wire [
permeability of air]
|
(a) |
(b) |
(c) |
(d) |
Two resistances
and
when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by
to that consumed by
will be
|
(a) 1 : 1 |
(b) 1 : 2 |
(c) 2 : 1 |
(d) 1 : 4 |
The maximum intensity of fringes in Young's experiment is I. If one of the slit is closed, then the intensity at that place becomes Io. Which of the following relation is true ?
|
(a) I = Io |
(b) I = 2Io |
|
(c) I = 4Io |
(d) There is no relation between I and Io |
E.C.E. of Cu and Ag are
and 1.2
A certain current deposits 14 gm of Cu. Amount of Ag deposited is
|
(a) 1.2 gm |
(b) 1.6 gm |
(c) 2.4 gm |
(d) 1.8 gm |