Q. The instantaneous magnitudes of the electric field and the magnetic field vectors in an electromagnetic wave propagations in vacuum are related as

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A

B

C

D

Solution:

At every instant the ratio of the magnitude of the electric field to that of magnetic field in an electromagnetic wave equal to the speed of light.

Questions from KCET 2022

1. Rotational kinetic energy of a body is given by the equation where is moment of inertia and angular velocity of the body. The dimensional formula of I using the above equation is

2. If and represent inductance, capacitance and resistance respectively, then which of the following does not have the dimension of the frequency?

3. A truck of mass Ton is moving with a speed of . Sand is poured at the rate of per minute. How much force is needed to keep it moving with the same speed?

4. A horizontal force is applied on a block of weight to hold against a vertical wall. The minimum value of force needed to hold the block if the coefficient of friction of the surface is

5. A bird is inside a wire cage hung from a spring balance. The spring balance reading is when the bird is flying and when it is at rest inside the cage. Which of the following is correct?

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2. If and respectively denote energy and gravitational constant, then has the dimensions of:

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3. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

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4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

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5. Calculate the acceleration of the block and trolly system shown in the figure The coefficient of kinetic friction between the trolly and the surface is , mass of the string is negligible and no other friction exists

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