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##### 14.4 A coil of 0.1 \mathrm{~m} \times 0.1 \mathrm{~m} and of 200 turns carrying a current of 1.0 \mathrm{~mA} is placed in a uniform magnetic field of 0.1 \mathrm{~T} . Calculate the maximum torque that acts on the coil.(Ans: 2.0 \times 10^{-4} \mathrm{Nm} )

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}