- AElectric charge.
- BElectric field.
- CBoth a and b.
- DNone.
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A part of a long wire carrying a current i is bent into a circle of radius r as shown in figure. The net magnetic field at the centre O of the circular loop is

|
(a) |
(b) |
(c) |
(d) |
$0$
$\delta$
$2\delta$
$3\delta$
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) |
A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by
|
(a) 1.05 |
(b) 3.16 |
(c) 2.11 |
(d) 4.22 |
A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror
|
(a) 176o |
(b) 4o |
(c) 178o |
(d) 2o |
To get the maximum current from a parallel combination of n identical cells each of internal resistance r in an external resistance R, when
|
(a) R >> r |
(b) R << r |
(c) R = r |
(d) None of these |