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Write a short note on electric bell.

Write a short note on electric bell.

A cylinder on whose surfaces there is a vertical electric field of varying magnitude as shown. The electric field is uniform on the top surface as well as on the bottom surface therefore, this cylinder encloses

What type of elastic fuse is used in electrical appliances like car stereos ? Explain with the help of a labelled diagram.

What is the electric potential at a point on the equatorial plane of a short electric dipole?

The top of a 15 metre high tower makes an angle of elevation of 60o with the bottom of an electric pole and angle of elevation of 30o with the top of the pole. What is the height of the electric pole? (a) 5 metres (b) 8 metres (c) 10 metres (d) 12 metres (e) None of these

A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at angle of depression of 30o , which is approaching to the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60o . Find the further time taken by the car to reach the foot of the tower.

A ladder is placed against a wall such that it just reaches the top of the wall.The foot of the ladder is at a distance of 5 metres from the wall. The angle of elevation of the top of the wall from the base of the ladder is 15^@ . What is the length (in metres) of the ladder? एक सीढ़ी दीवार के सहारे इस प्रकार खड़ी है कि वह दीवार की चोटी तक पहुँचाती है। सीढ़ी का आधार दीवार से 5 मीटर की दूरी पर है। सीढ़ी के आधार से दीवार की चोटी का उन्नयन कोण 15^@ है। सीढ़ी को लंबाई (मीटर में) क्या है?