Question
Alternating current cannot be measured by de ammeter because:

Answer

(b)Average value of current for a complete cycle is zero.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Assertion  :   When radius of circular loop carrying current is doubled, its magnetic moment becomes four times.
Reason      : Magnetic moment depends on area of the loop.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 
The frequency of light ray having the wavelength $3000 \mathring A$ is
If the cathode$-$anode potential difference in an $X-$ray tube be $10^5 V,$ then the maximum energy of $X-$ray photon can be
In the circuit shown in figure the maximum output voltage $V_0$ is

 
Wave nature of light is verified by(a) Interference(b) Photoelectric effect(c) Reflection(d) Refraction
       
Meena draws magnetic field lines of the field close to the axis of a current carrying circular loop. As she moves away from the center of the circular loop she observes that the lines keep ?
Excitation energy of a hydrogen like ion in its first excitation state is 40.8 eV. Energy needed to remove the electron from the ion in ground state is(a) 54.4 eV(b) 13.6 eV(c) 40.8 eV(d) 27.2 eV
       
A charged body has an electric flux F associated with it. Now if the body is place inside a conducting shell then the electric flux outside the shell is:
The energy density of magnetic field $\vec{B}$ is :
A pure resistor is joined with a capacitor. The magni- tude of tangent of their phase difference in the cir- cuit is: