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Two point charges +4muC and -10 muC are...

Two point charges `+4muC and -10 muC` are placed 10 cm apart in air. A dielectric slab of large length and breadth but of thickeness 5 cm is placed between them. Calculate the force of attraction between the charges, if the relative permittivity of dielectric is 9.

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The correct Answer is:
9
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