Whenever there is continuous changes of magnetic flux linked with closed coil a current is generated in coil. This is ……………..
A) Lenz’s law
B) Ampere’s law
C) Faraday’s law
D) Ohm’s law
1 Answers
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If B is the magnetic flux density and A is the area of the plane then the magnetic flux is given by
Correct option is A) AB
2 Answers 1 views
A current carrying circular coil has ‘n’ turns. The magnetic field produced in the entire coil is
C) ‘n’ times as large as that produced by a single turn
2 Answers 1 views
A coil has 200 turns. If an increase in , magnetic flux through one turn of coil is 0.001 Wb in 0.1 sec, then the maximum
Correct option is B) 2 V
2 Answers 4 views
…………………. generated in a closed loop is equal to the rate of change of magnetic flux passing through it.
B) Induced emf
2 Answers 1 views
The electric flux over a sphere of radius 1.0 m is ø. If the radius of the sphere is doubled without changing the charge, the flux will be
Correct option is: (C) ø
2 Answers 3 views
A potential difference of 20 V is applied across the ends of a coil. The amount of heat generated in it is 800 cal/s. The value of resistance
Correct option is: (C) 0.12 Ω
2 Answers 1 views
What is magnetic flux? What is unit of magnetic flux in SI system?
1. The number of lines of force per unit area is called magnetic flux (ø). 2. SI unit of magnetic flux (ø) is weber (Wb).
2 Answers 1 views
Define the following magnetic parameters. i. Magnetic axis ii. Magnetic equator iii. Magnetic Meridian
i. Magnetic axis: The Earth is considered to be a huge magnetic dipole. The straight line joining the two poles is called the magnetic axis. ii. Magnetic equator: A great circle in...
2 Answers 1 views
When the current change from `+2A` to `2A` in `0.05` second, an e.m.f. of `8V` is induced in a coil. The coefficient of self-induction of the coil is
Correct Answer - A `e=L(di)/(dt)implies8=Lxx((2-(-2)))/(0.05)impliesL=0.1H`
2 Answers 1 views
The area of the coil in a moving coil galvanometer is `15cm^(2)` and has 20 turns. The magnetic induction is `0.2T` and the couple per unit twist of t
Correct Answer - 1 `tau theta=BAIn`
2 Answers 3 views