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6.

The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is 


A) 3 V/m

B) 6 V/m

C) 9 V/m

D) 12 V/m



7.

Two coherent point sources S1 and S2   are separated by a small distance d as shown. The fringes obtained on the screen will be

3132021758_p9.JPG


A) points

B) staight lines

C) semi-circle

D) concentric circles



8.

In L-C-R circuit as shown below both switches are open initially. Now switch S1 and S2, are closed .(q is charge on the capacitor  and 

$\tau$=RC is capacitance time constant) . Which of the following statement is correct?

3132021770_p8.JPG

 


A) Workdone by the battery is half of the energy dissipated in the resistor

B) At $t= \tau,q=CV/2$

C) $t= 2\tau,q=CV(1-e^{-2})$

D) $t= \frac{\tau}{2},q=CV(1-e^{-1})$



9.

This question has statement I  and statement II. Of the four choices given after the statements, choose the one that best describes the two statements.

 Statement I:   higher the range, the greater is the resistance of ammeter

 Statement II: To increase the range of ammeter, additional shunt needs to be used across it.


A) statement I is true , statement II is true and statementII is the correct explanation of statement I

B) Statement I is true , statement II is true, but statement II is not the correct explanation of statement I

C) Statement I is true , statement II is false

D) statement I is false , statement II is true



10.

An ideal gas enclosed in a  vertical cylindrical container supports a freely moving piston of mass M. the piston and the cylinder have equal cross-sectional area A,  when the piston is in equilibrium, the volume of the gas is V0 and its pressure is P0. The piston is slightly displaced from the equilibrium position and released. Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency


A) $\frac{1}{2\pi}\frac{A_{r}p_{0}}{V_{0b}M}$

B) $\frac{1}{2\pi}\frac{V_{0}Mp_{0}}{A^{2}\gamma}$

C) $\frac{1}{2\pi}\sqrt{\frac{A^{2} \gamma p_{0}}{V_{0}M}}$

D) $\frac{1}{2\pi}\sqrt{\frac{V_{0}M}{A_{\gamma}p_{0}}}$



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