Armature current in dc motor will be maximum when(a) Motor has acquired maximum speed(b) Motor has acquired intermediate speed(c) Motor has just started moving(d) Motor is switched off

(c) Motor has just started moving

Armature current in dc motor will be maximum when(a) Motor has ac…

Sun radiates continuously and maintains its brightness because(a) Helium is converted into iron in its core(b) Of fusion of hydrogen nuclei into helium(c) Fusion of helium in hydrogen(d) Burning of carbon, in its core

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What is not true of equipotential surface?

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A long, straight wire of radius $R$ carries a current distributed uniformly over its cross section. $T$ he magnitude of the magnetic field is:

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Which of the following statements is false?

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The apparent wavelength of the light from a star moving away from the earth is 0.01% more than its real wavelength. Then the velocity of star is(a) 60 km/sec(b) 15 km/sec(c) 150 km/sec(d) 30 km/sec

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Electric charge is measured in:

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To convert mechanical energy into electrical energy, one can use:

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Zener diode is used for:

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An $AC$ source producing emf $\epsilon=\epsilon_{0}\Big[\cos\big(100\pi\text{s}^{-1}\big)\text{t}+\cos\big(500\pi\text{s}^{-1}\big)\text{t}\Big]$ is connected in series with a capacitor and a resistor. The steady$-$state current in the circuit is found to be $\text{i}=\text{i}_1\cos\Big[\big(100\pi\text{s}^{-1}\big)\text{t}+\phi_1\Big]+\text{i}_2\cos\Big[\big(500\pi\text{s}^{-1}\big)\text{t}+\phi_2\Big].$

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Digital signals are :

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