1)why do not two magnetic field lines intersect each other?
2)Why does a compass needle get deflected when bought near a bar
magnet?
3)An electric bulb is rated as220V and100W.When it is operated on 110V
what will be the amount of power consumed?
4)How is voltmeter connected in circuit to measure the potential
difference between two points?
5)Draw Ray diagram for convex lens when object is at(1) 2F. (2)
between focus band optical center of the lens.
Answers
Answer:
1. Two magnetic field lines do not intersect each other due to the fact that the resultant force on a north pole at any point can be only in one direction. ... this means that resultant force on a north place at the point of intersecting will be along two directions, which is not possible.
2. The compass needle is a small magnet. That's why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected near the magnet bar.
3.R = 220^2/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed = V^2/R = 110^2/484 = 25 W. So, 25 W power is consumed when it is operated on 110 V.
4. An ammeter is a measuring device used to measure the electric current in a circuit. A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.
I think it will help u alot
