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A laser beam is of 9 mW, diameter = 2 mm. Then what is the amplitude of magnetic field associated with it ?
49 µT
98 µT
9.8 µT
4.9 µT
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The magnetic moment of a current I carrying circular coil of radius r and number of turns N varies as______
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Two capacitors, 3 µF and 4 µF, are individually charged across a 6 V battery. After being disconnected from the battery, they are connected together with the negative plate of one connected to the positive plate of the other . What is the final total energy stored ?
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