1
KCET 2022
MCQ (Single Correct Answer)
+1
-0

Which of the following statements proves that Earth has a magnetic field ?

A
Earth is a planet rotating about the NorthSouth axis.
B
Earth is surrounded by ionosphere.
C
A large quantity of iron-ore is found in the Earth.
D
The intensity of cosmic rays stream of charged particles is more at the poles than at the equator.
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

A copper rod $$A B$$ of length $$l$$ is rotated about end $$A$$ with a constant angular velocity $$\omega$$. The electric field at a distance $$x$$ from the axis of rotation is

A
$$\frac{m \omega^2 x}{e}$$
B
$$\frac{m \omega x}{e}$$
C
$$\frac{m x}{\omega^2 l}$$
D
$$\frac{m e}{\omega^2 x}$$
3
KCET 2021
MCQ (Single Correct Answer)
+1
-0

A strong magnetic field is applied on a stationary electron. Then, the electron

A
moves in the direction of the field
B
moves in an opposite direction of the field
C
remains stationary
D
starts spinning
4
KCET 2021
MCQ (Single Correct Answer)
+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]
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