Explanation:
Yes, the angle of dip at a place is equal to 45o, when the vertical and horizontal components of earth’s magnetic field are equal. In this case $\rightarrow δ=45^\circ$
$\tan\delta=\frac{\text{B}_\text{v}}{\text{B}_\text{v}}=1$
So, BV = BH.
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The tail of the comet is due to
|
(a) Vaporisation of water on the comet |
|
(b) Sublimation of vapour in the comet |
|
(c) Cooling of water in the comet |
|
(d) Vaporisation of heat in the comet |
A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is 
seconds. One of the magnets is removed and if the other magnet oscillates in the same field, then the time period in seconds is
(a) 
|
(b)
|
(c) 2 |
(d) 
|
Cathode rays are produced when the pressure is of the order of
|
(a) 2 cm of Hg |
(b) 0.1 cm of Hg |
(c) 0.01 mm of Hg |
(d) 1 μm of Hg |
A charge of 1C is moving in a magnetic field of 0.5Tesla with a velocity of 10m/sec Perpendicular to the field. Force experienced is
|
(a) 5 N |
(b) 10 N |
(b) 10 N |
(d) 0 N |
The length of the optical path of two media in contact of length 
and 
of refractive indices 
and 
respectively, is
(a) 
|
(b) 
|
(c) |
(d) |
The magnetic moment of a current (i) carrying circular coil of radius (r) and number of turns (n) varies as
|
(a) 1/ r2 |
(b) 1/ r |
(c) r |
(d) r2 |
