A small cylindrical soft iron piece is kept in a galvanometer so that
|
(a) A radial uniform magnetic field is produced |
|
(b) A uniform magnetic field is produced |
|
(c) There is a steady deflection of the coil |
|
(d) All of these |
(d) All of these
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Pure inductance of 3.0 H is connected as shown below. The equivalent inductance of the circuit is
|
(a) 1 H |
(b) 2 H |
(c) 3 H |
(d) 9 H |
Two batteries, one of emf 18 volts and internal resistance 2Ω and the other of emf 12 volt and internal resistance 1 Ω, are connected as shown. The voltmeter V will record a reading of
|
(a) 15 volt |
(b) 30 volt |
(c) 14 volt |
(d) 18 volt |
The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations. Let 
and 
be the intensities and 
and 
be the frequencies for the curves a, b and c respectively
|
(a) |
(b) |
|
(c) |
(d) |
The image of point P when viewed from top of the slabs will be
|
(a) 2.0 cm above P |
(b) 1.5 cm above P |
(c) 2.0 cm below P |
(d) 1 cm above P |
A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
|
(a) Get deflected vertically upwards |
|
(b) Move in a circular orbit with its speed increased |
|
(c) Move in a circular orbit with its speed unchanged |
|
(d) Continue to move due east |
Equal charges q are placed at the vertices A and B of an equilateral triangle ABC of side a. The magnitude of electric field at the point C is
|
(a) |
(b) |
(c) |
(d) |
In hydrogen atom, an electron is revolving in the orbit of radius 0.53
with 6.6 
rotations/second. Magnetic field produced at the centre of the orbit is
|
(a) 0.125 |
(b) 1.25 |
(c) 12.5 |
(d) 125 |
