Question 24: Electromagnetic Induction

Question

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5 A, then the average force on each electron in the coil due to the magnetic field is

Accepted Answer

Magnetic Lorenz force acting on each electron,
$$F=evB$$ ..... (i)
As, current, $$i=neAv$$
$$ev=\frac{i}{nA}$$
Therefore, substituting value of $$ev$$ into Eq. (i),
$$F=\frac{i}{nA}B$$
Given, $$i=5~A,n=20$$ turns, $$B = 0.1$$ T
$$F = eVB = {{iB} \over {nA}} = {{5 	imes 0.1} \over {{{10}^{29}} 	imes {{10}^{ - 5}}}} = 5 	imes {10^{ - 25}}N$$

Answer

$$2.5	imes10^{-25}$$ N

Answer

$$4.5	imes10^{-25}$$ N

Answer

$$5	imes10^{-25}$$ N

Answer

$$5.5	imes10^{-25}$$ N

Electromagnetic Induction

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5 A, then the average force on each electron in the coil due to the magnetic field is

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