A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is
1. 3 A
2. 30 A
3. 0.3 A
4. 2.4 A
Subtopic: Transformer |
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A black body at a temperature of 2600 K has the wavelength corresponding to maximum emission 1200Å. Assuming the moon to be perfectly black body the temperature of the moon, if the wavelength corresponding to maximum emission if 5000 Å is
1. 7800 K
2. 6240 K
3. 5240 K
4. 3640 K
Subtopic: Wien's Displacement Law |
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6Ω and 12Ω resistors are connected in parallel. This combination is connected in series with a 10 V battery and 6Ω resistor. What is the potential difference between the terminals of the 12Ω resistor?
1. 4 V
2. 16 V
3. 2
4. 8 V
Subtopic: EMF & Terminal Voltage |
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Charge passing through a conductor of cross section area A = 0.3m2 is given by q = 3t2 +5t+2 in coulomb, where t is in second. What is the value of drift velocity at t = 2s? (Given, n = 2×1025/m3)