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  1. A

    In a triangle ABC if the sides are in the ratio 4:5:7 then r:R=?

    The ratio of the r:R is solved in the image given below:
  2. A

    Find the resultant of two vectors of 50N and 80N acting at a point of an angle of 60°?

    Given, F1=50N F2=80N θ= 60º The resultant of vectors acting on a point using parallelogram law is given by, R =√ (F12+F22+2F1*F2 cosθ) N therefore, R =√ (50+80+2*50*80* cos 60º) N R = 113.57 N
  3. A

    Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and the distance between them is doubled,

    Original force, F=kqq/r^2 New force =(kq/2q/2)/(2r)^2=F/16
  4. A

    Three parallel-connected resistors when connected across a DC voltage source dissipate a total power of 72 W. The total current drawn is 6 A.

    Let the total resistance is Req and dc voltage is V voltage and total current be I amp then. Total power P = 72W and I = 6A V*I = 72 Then V = 12V Current through first resistor is I1 3A let it resistance is R1 then. 12/R1 = 3 R1= 4 Let second resistance is R2 and current flowing through it is...
  5. A

    Two point charges 8 nC and 16 nC are placed at the corners B and C of an equilateral triangle of side 3 cm . The magnitude of the electric field at th

    Answer: - Let E1 be electric field due to charge 16nc. Let E2 be electric field due to charge 8nc. E = 1 / 4 П Е (q1 / r²) The resultant electric field is given by = √ (E1² + E2² + 2.E1.E2.cos Ф Here E1 - 16 x 10⁴, E2 - 8 x 10⁴, since it is equilateral triangle Ф = 60° Substituting the...
  6. A

    What is the type of combination in driver and driven cell in potentiometer?

    In a potentiometer, the driver cell is typically a bipolar junction transistor (BJT) that is biased in the active region. The driven cell is typically a resistor that is connected to the output of the driver cell. The output voltage of the potentiometer is determined by the position of the wiper...
  7. A

    Is it true that in a conductor having 0 ohm resistance then it doesn't need any voltage supply for the flow of electric current? And if yes then why?

    Only superconductors have zero resistance. Typically, that happens under rather special conditions, such as very low temperature and special materials. But zero resistance (and it really is zero, as far as anyone has been able to determine) does not mean zero impedance. If you connect a voltage...
  8. A

    In the circuit find the resistance between terminals A and B when switch is open and closed. why both are equal?

    here in the image below is shown the resultant resistance in both the conditions:
  9. A

    A kitten of mass 0.60kg leaps 30° to the horizontal out of a toy truck of mass 1.2kg causing it to move over horizontal ground at 4.0m/s. At what spee

    (Mass of truck) (velocity of truck) = (mass of kitten) (horizontal component of kitten's momentum) (Mass of kitten) (horizontal component of kitten's momentum) = (mass of truck) (velocity of truck) (0.6 kg) (horizontal component of kitten's momentum) = (1.2 kg) (4 m/s) horizontal component of...
  10. A

    Arocket carrying a satellite is acccelerating straight up from the earth surface.At 1.15s after liftoff,the rocket clear the top of its launch platfor

    Answer: 197.263157895 m/s 169.491525424 m/s Explanation: x Denotes position t Denotes time Average velocity is given by, The average velocity is 197.263157895 m/s. The average velocity is 169.491525424 m/s.
  11. A

    Calculate the equivalent resistance of the network between terminals A and B.

    6Ω & 3Ω in parallel so the resultant of it will be -- 1/R= 1/6+1/3...... so its equivalent is 2Ω 2Ω & 6Ω is in series combination so the resultant R= 2 + 6 = 8Ω 8Ω & 8Ω is in parallel combination so the resultant 1/R= 1/8 + 1/8 ..... so its equivalent is 4Ω 4Ω & 4Ω(the resultant of 8Ω & 8Ω) is...
  12. A

    For any triangle ABC prove that Sin B-C/2=B-C/A cos A/

    solution of the question is attached with this
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