A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to
|
(a) Contract |
(b) Expand |
|
(c) Move towards +ve x –axis |
(d) Move towards –ve x-axis |
(b) Expand
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A galvanometer has a resistance of 25 ohm and a maximum of 0.01 A current can be passed through it. In order to change it into an ammeter of range 10 A, the shunt resistance required is
|
(a) 5/999 ohm |
(b) 10/999 ohm |
(c) 20/999 ohm |
(d) 25/999 ohm |
A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. The emergent ray is
|
(a) Normal to the face through which it emerges |
|
(b) Inclined at 30° to the face through which it emerges |
|
(c) Inclined at 60° to the face through which it emerges |
|
(d) None of these |
When current in a coil changes to 2 ampere from 8 ampere in 3 
, the e.m.f. induced in the coil is 2 volt. The self inductance of the coil in millihenry is
|
(a) 1 |
(b) 5 |
(c) 20 |
(d) 10 |
Ten capacitor are joined in parallel and charged with a battery up to a potential V. They are then disconnected from battery and joined again in series then the potential of this combination will be
|
(a) V |
(b) 10V |
(c) 5V |
(d) 2V |
Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand
| (a) None | (b) 1 | (c) 2 | (d) 3 |