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Magnitude of induced emf produced in a coil when a magnet is inserted into it depends on the

$\begin {array} {1 1} (1)\;\text{No. of turns in the coil} & \quad (2)\;\text{Resistance of the coil} \\ (3)\;\text{Magnetic moment of the magnet} & \quad (4)\;\text{Speed of approach of the magnet} \end {array}$


$\begin {array} {1 1} (a)\;1,2 & \quad (b)\;2 \\ (c)\;3,4 & \quad (d)\;1,3,4 \end {array}$


1 Answer

Induced emf $e = \large\frac{ \Delta \phi}{ \Delta t}$
So, $e = \large\frac{nBA}{t}$
As no. of turns increases, induced emf increases.
More is the magnetic moment of the magnet, more is the magnetic field produced by it hence is the induced emf.
With increase in the speed of the magnet, change in magnetic flux linked with coil changes, hence induced emf changes.
Ans : (d)
answered Mar 1, 2014 by thanvigandhi_1

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