Magnetism And Matter — Physics STD 12 Science — Question

A mass m = 20 g  has a charge q = 30 mC. It moves with a velocity of 20 m/s  and enters a region of electric field of 80 N/C in the same direction as the velocity of the mass. The velocity of the mass after 3 seconds in this region is

(a) 80 m/s

(b) 56 m/s

(c) 44 m/s

(d) 40 m/s

Of the following pairs of species which one will have the same electronic configuration for both members?

If L is the coherence length and c the velocity of light, the coherent time is

(a) cL

(b)

(c)

(d)

Fundamental gates are :

Water molecule is the example of:

If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be

(a) Only inside the pipe	(b) Only outside the pipe
(c) Neither inside nor outside the pipe	(d) Both inside and outside the pipe

In the figure is shown Young’s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11^th fringe on the other side, as measured from Q. If the wavelength of the light used is 6000 ,  then   will be equal to

(a) 6

(b) 6.6

(c) 3.138

(d) 3.144

While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure:

1. Larger friction.
2. Smaller friction.
3. Larger normal force.
4. Smaller normal force.