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A point charge q is placed in front of a conducting solid cube of edge a at a distance d from its centre (d > a/2). What is the magnitude of electric field at the centre of the cube due to the charges appearing on its surface?

A)

B)

C) 0

D)

E) None of the options given

Correct

Net electric field inside a conductor is zero.

Hence, field due to q should get cancelled by the field due to the induced charges.

Field due to q =

Field due to the induced charges should be equal to the above in magnitude but opposite in direction.

Incorrect

Net electric field inside a conductor is zero.

Hence, field due to q should get cancelled by the field due to the induced charges.

Field due to q =

Field due to the induced charges should be equal to the above in magnitude but opposite in direction.

A mass of 10 kg is at a point A on the table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

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A worker going away from a factory at a speed of 10 m/s hears siren of the factory. If the dominant frequency of the siren is 600 Hz and wind is blowing along the direction of his motion at a speed of 10 m/s, find the dominant frequency as heard by the worker. Speed of sound is 340 m/s.

Correct

In Doppler's formula, the speeds v_{s} and v_{l} both are with respect to the medium.

So,

So,

Incorrect

In Doppler's formula, the speeds v_{s} and v_{l} both are with respect to the medium.

So,

So,

Hint

In Doppler's formula, the speeds v_{s} and v_{l} both are with respect to the medium.