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State Lenz’s law.

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प्रश्न

State Lenz’s law.

एक पंक्ति में उत्तर
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उत्तर

Lenz’s law states that the direction of the induced current is such that it always opposes the cause responsible for its production.

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अध्याय 4: Electromagnetic Induction And Alternating Current - Evaluation [पृष्ठ २६०]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 12 TN Board
अध्याय 4 Electromagnetic Induction And Alternating Current
Evaluation | Q II. 3. | पृष्ठ २६०

संबंधित प्रश्न

Electric field intensity in free space at a distance ‘r’ outside the charged conducting sphere of radius ‘R’ in terms of surface charge density ‘ a ’ is............................

(a)`sigma / in_0[R/r]^2`

(b)`in_0/sigma[R/r]^2`

(c)`R/r[sigma/in_0]^2`

(d)`R/sigma[r/in_0]^2`

 


State three differences between direct current and alternating current.


 Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.


A line charge λ per unit length is lodged uniformly onto the rim of a wheel of mass M and radius R. The wheel has light non-conducting spokes and is free to rotate without friction about its axis (Figure). A uniform magnetic field extends over a circular region within the rim. It is given by,

B = − B0 k (r ≤ a; a < R)

= 0 (otherwise)

What is the angular velocity of the wheel after the field is suddenly switched off?


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.


Can you find the magnitude of current using Fleming's right hand rule?

A coil has a self-inductance of 0·05 Henry. Find the magnitude of the emf induced in it when the current flowing through it is changing at the rate of 100 As-1.


What is an electromagnet? What do you know about the simplest form of an electromagnet?


Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire. 


Write the two names in the following diagram.

Fleming’s right hand rule.


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