1
KCET 2021
+1
-0

Two parallel wires in free space are $$10 \mathrm{~cm}$$ apart and each carries a current of $$10 \mathrm{~A}$$ in the same direction. The force exerted by one wire on the other [per unit length] is

A
$$2 \times 10^{-4} \mathrm{~Nm}^{-1}$$ [attractive]
B
$$2 \times 10^{-7} \mathrm{~Nm}^{-1}$$ [attractive]
C
$$2 \times 10^{-4} \mathrm{~Nm}^{-1}$$ [repulsive]
D
$$2 \times 10^{-7} \mathrm{~Nm}^{-1}$$ [repulsive]
2
KCET 2021
+1
-0

A toroid with thick windings of $$N$$ turns has inner and outer radii $$R_1$$ and $$R_2$$, respectively. If it carries certain steady current $$I$$, the variation of the magnetic field due to the toroid with radial distance is correctly graphed in

A
B
C
D
3
KCET 2021
+1
-0

A tightly wound long solenoid has $n$ turns per unit length, a radius $$r$$ and carries a current $$I$$. A particle having charge $$q$$ and mass $$m$$ is projected from a point on the axis in a direction perpendicular to the axis. The maximum speed of the particle for which the particle does not strike the solenoid is

A
$$\frac{\mu_0 n I q r}{m}$$
B
$$\frac{\mu_0 n I q r}{2 m}$$
C
$$\frac{\mu_0 n I q r}{4 m}$$
D
$$\frac{\mu_0 n I q r}{8 m}$$
4
KCET 2021
+1
-0

Which of the field pattern given below is valid for electric field as well as for magnetic field?

A
B
C
D
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