# Class 10 Physics Electromagnetism

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$A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is:A) F=I / B B) F=I / B \sin \theta C) \mathrm{F}=0 D) \mathrm{F}=\mathrm{l} / \mathrm{B} \cos \theta$

$15.8. What are the factors which affect the magnitude of the e.m.f. induced in a circuit by a changing magnetic field?$

$Magnetic lines of force.A) Intersect at infinityB) Cannot intersect at allC) Intersect with in the magnetD) Intersect at the neutral points$

$14.12. An Iron core solenold with 400 turns has a cross section area of 4.0 \mathrm{~cm}^{2} . A current of 2 amp passing through it produces \mathrm{B}=0.5 webers-m { }^{-2} . How targe an emf is induced in it. If the current is twrned of in 0.1 seconds. What is the self Inductance of the solenold ? (Ans 0.8 \mathrm{~V} L=40 \mathrm{mh} ).$

$15.1. Suppose someone handed you three similar iron bars and told you one was not magnet but the other two were. How would you find the iron bar that was notmagnet?$

$The relationship between tesla (T) and smaller unit Gauss ( G ) of magnetic induction is given by:A) 1 \mathrm{~T}=10^{3} \mathrm{G} B) 1 \mathrm{~T}=10^{-4} \mathrm{G} C) 1 \mathrm{~T}=10^{-2} \mathrm{G} D) 1 \mathrm{~T}=10^{4} \mathrm{G}$