- ASpace surrounding the magnet in which magnetic force acts.
- BSpace surrounding the magnet in which electric force acts.
- CSpace surrounding the magnet in which no force acts.
- DNone.
Explanation:
A magnetic field is generated when electric charge carriers such as electrons move through space or within an electrical conductor. It is the space surrounding the magnet in which magnetic force acts. Its intensity is represented by magnetic lines of force.
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A small coil C with N = 200 turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in figure. The cross sectional area of coil is A= 1.0 cm2, length of arm OA of the balance beam is l = 30 cm. When there is no current in the coil the balance is in equilibrium. On passing a current I = 22 mA through the coil the equilibrium is restored by putting the additional counter weight of mass ∆m = 60 mg on the balance pan. Find the magnetic induction at the spot where coil is located.

|
(a) 0.4 T |
(b) 0.3 T |
(c) 0.2 T |
(d) 0.1 T |
The spectrum of iodine gas under white light will be
|
(a) Only violet |
|
(b) Bright lines |
|
(c) Only red lines |
|
(d) Some black bands in continuous spectrum |
A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm
|
(a) + 3.0 D |
(b) + 0.125 D |
(c) – 3.0 D |
(d) + 4.0 D |
Two capacitors of 1mF and 2mF are connected in series, the resultant capacitance will be
|
(a) 4μF |
(b) |
(c) |
(d) 3 μF |
Water of volume 2 litre in a container is heated with a coil of 1 kW at 27 oC. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27oC to 77oC [Given specific heat of water is 4.2 kJ/kg]
|
(a) 8 min 20 s |
(b) 6 min 2 s |
(c) 7 min |
(d) 14 min |
An electron is travelling horizontally towards east. A magnetic field in vertically downward direction exerts a force on the electron along
|
(a) East |
(b) West |
(c) North |
(d) South |