Q.How many four-digit numbers, with distinct digits are there such that the sum of the digits of each of these numbers is an odd natural number? A.2160 b.2090 c.1880 d.2376
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At the center of a current carrying coil, the magnetic field intensity is directlyproportional to the current and inversely proportional to the radius of the coil. So, if the current is doubled and radius is halved, then the value of B increases by 4 times the initial value
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