- AMoving charge
- BChange in magnetic flux
- CCurrent flowing in conductor
- DStationary charge
Explanation:
Magnetic field is the magnetic effect of electric currents andmagnetic materials.
The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is represented by a vector field.
As magnetic field has both magnitude as well as direction so it is a vector quantity.When charges are stationary, their electric fields do not affect magnets.
But, when charges move, they produce magnetic fields that exert forces on other magnets.
When there is relative motion, a connection between electric and magnetic fields emerges—each affects the other.
Quantity that is not affected by magnetic field is Stationary charge.
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The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately
|
(a) 0.230 per minute |
(b) 0.461 per minute |
|
(c) 0.691 per minute |
(d) 0.922 per minute |
If a charged spherical conductor of radius 10 cm has potential V at a point distant 5 cm from its centre, then the potential at a point distant 15 cm from the centre will be
|
(a) |
(b) |
(c) |
(d) 3V |
The capacity of a parallel plate condenser is C. Its capacity when the separation between the plates is halved will be
|
(a) 4 C |
(b) 2C |
(c) |
(d) |
Soap bubble appears coloured due to the phenomenon of
|
(a) Interference |
(b) Diffraction |
(c) Dispersion |
(d) Reflection |
Two nucleons are at a separation of 1
. The net force between them is
, if both are neutrons,
if both are protons and
if one is a proton and other is a neutron. In such a case
|
(a) |
(b) |
(c) |
(d) |

One cannot see through fog because .......... :

A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance r and then returns. If q were given a speed 2v, the closest distances of approach would be
|
(a) r |
(b) 2r |
(c) r/2 |
(d) r/4 |
The nuclear reaction
(mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is
|
(a) Fusion reaction releasing 24 MeV energy |
|
(b) Fusion reaction absorbing 24 MeV energy |
|
(c) Fission reaction releasing 0.0258 MeV energy |
|
(d) Fission reaction absorbing 0.0258 MeV energy |