Explanation:
According to the first law of the limiting friction,
$\text{f}=\mu\text{N}$
where f is the frictional force
$\mu$ is the coefficient of friction
N is the normal reaction force
When we take smaller steps on ice, the normal reaction force exerted by the ice is small. Therefore, the smaller steps ensure smaller friction.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A straight wire carrying a current 
runs along the axis of a circular current 
. Then the force of interaction between the two current carrying conductors is
|
(a) ∞ |
(b) Zero |
(c) |
(d) |
An electron moves with a constant speed v along a circle of radius r. Its magnetic moment will be (e is the electron's charge)
|
(a) evr |
(b) |
(c) |
(d) 2πrev |
A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v, The radius of the circular path described by it will be
|
(a) Bq/mv |
(b) mq/Bv |
(c) mB/qv |
(d) mv/Bq |
Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90o. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio
|
(a) 0 : 1 : 4 |
(b) 4 : 1 : 0 |
(c) 0 : 1 : 2 |
(d) 2 : 1 : 0 |
The frequencies of X-rays, g-rays and ultraviolet rays are respectively a, b and c. Then
|
(a) a < b, b > c |
(b) a > b, b > c |
(c) a > b, b < c |
(d) a < b, b < c |
