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A projectile is thrown at angle with vertical. It reaches a maximum height H. The time taken to reach the highest point of its path is
The correct answer is:
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A solenoid has 2000 turns wound over a length of 0.30 m. The area of its cross-section is Around its central section a coil of 300 turns is wound. If an initial current of 2 A in the solenoid is reversed in 0.25s, the emf induced in the coil is
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An inductance and a resistance are first connected to a battery. After some time the battery is disconnected but and remain connected in a closed circuit. Then the current reduces to 37% of its initial value in
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A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is approximately
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