Physics

# If voltage V=(100 $\pm$ 5) V and current I=(10 $\pm$ 0.2) A, the percentage error in resistance R is

$7$%

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Single Correct Medium Published on 18th 08, 2020
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#### Realted Questions

Q1 Single Correct Medium
If $y$ represents the pressure and $x$ represents the position then dimensional expression of $\int { \dfrac { dx }{ \sqrt { p^{ 2 }- y^2} } }$
• A. $[ML^2T^{-2}]$
• B. $[M^{-1}L^2T^{2}]$
• C. $[M^{-1}L^2T^{-2}]$
• D. $[ML^2T^{2}]$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Subjective Medium
How is the correctness of a formula or a relation is checked using the dimensional equations? Explain with examples.

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

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The period of oscillation of a simple pendulum is $T = 2\pi \sqrt {L/g} .$ Measured value of  L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using a wrist watch of 1 sec resolution. What is the accuracy in the determination of  g?

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
If $m,e,{\varepsilon _0},$ and $c$ denote mass electron, charge of electron Plank's constant and speed of light, respectively. The dimensions of $\frac{{m{e^4}}}{{\varepsilon _0^2{h^3}c}}$ are
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Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
If ${ \mu }_{ 0 }$ be the permeability and ${ \varepsilon }_{ 0 }$ be the permittivity of a medium, then its refractive index is given by
• A. $\dfrac { 1 }{ \sqrt { { { \mu }_{ 0 }\varepsilon }_{ 0 } } }$
• B. $\dfrac { 1 }{ { { { \mu }_{ 0 }\varepsilon }_{ 0 } } }$
• C. ${ \sqrt { { { \mu }_{ 0 }\varepsilon }_{ 0 } } }$
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Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020