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प्रश्न
State the factors on which the strength of an electromagnet depends. How does it depend on these factors?
Explain the factors on which the strength of an electromagnet depends.
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उत्तर
Strength of an electromagnet depends on the following factors:
- Number of turns in the coil: By increasing the number of turns in the coil, the strength of the electromagnet can be increased.
- Current flowing through the coil: By increasing the flow of current in the coil, the strength of the electromagnet can be increased.
- Length of air gaps between poles: By reducing the length of air gaps between the poles, the strength of the electromagnet can be increased.
संबंधित प्रश्न
State three ways in which the strength of an electromagnet can be increased.
When Puja, a student of 10th class, watched her mother washing clothes in the open, she observed coloured soap bubbles and was curious to know why the soap bubbles appear coloured. In the evening when her father, an engineer by profession, came home, she asked him this question. Her father explained to her the basic phenomenon of physics due to which the soap bubbles appear coloured.
(a) What according to you are the values displayed by Puja and her father?
(b) State the phenomenon of light involved in the formation of coloured soap bubbles.
Calculate the dimensions of (a) \[\int \overrightarrow{E} . d \overrightarrow{l,}\] (b) vBl and (c) \[\frac{d \Phi_B}{dt}.\] The symbols have their usual meaning.
Complete the following diagram of a transformer and name the parts labeled A and B. Name the part you have drawn to complete the diagram . What is the material of this part? In this transformer a step-up or step-down? Why?
The diagram shows a rectangular coil ABCD, suspended freely between the concave pole pieces of a permanent horseshoe magnet, such that the plane of the coil is parallel to the magnetic field.
- State your observation when the current is switched on.
- Give an explanation for your observation in (i).
- State the rule, which will help you to find the motion of rotation of the coil.
- In which position will the coil ultimately come to rest?
- State four ways of increasing the magnitude of force acting on the coil.
Which of the following instruments works by electromagnetic induction?
Which of the following phenomena makes use of electromagnetic induction?
In the current carrying conductor (AOCDEFG) as shown, the magnetic induction at point O is ______.
(R1 and R2 are radii of CD and EF respectively. l = current in the loop, μ0 = permeability of free space)
Which type of force is experienced by a moving charge in a magnetic field?
Which movement of a coil can produce a current?
