211. Permanent magnets are normally made of
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212. Energy stored by a coil is doubled when its currest is increased by ...... percent.
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213. The rate of rise of current through an inductive coil is maximum
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214. When both the inductance and resistance of a coil are doubled the value of
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215. The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is .... A/s
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216. A material for should have
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217. Conductivity is analogous to
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