The Area Of The Parallelogram Whose Adjacent Sides Are 2i 3k And 4j 2k Is
1) 2√14 2) 4√14 3) 16√14 4) √14 Answer: (2) 4√14 Solution: Suppose, a=2i−3k,b=4j+2k \(\begin{array}{l}a \times b=\left|\begin{array}{ccc} i & j... View Article
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If The Scalar Projection Of The Vector Xijk On The Vector 2ij5k Is 1 Root30 Then The Value Of X Is
1) –5/2 2) 6 3) –6 4) 3 Answer: (1) -5/2 Solution: Scalar projection of the vector xi+j+k on the... View Article
If A B And C Are Three Unit Vectors Such That A B C 0 Where 0 Is Null Vector Then Ab Bc Ca Is Equal To
1) -3 2) -2 3) -3/2 4) 0 Answer: (3) -3/2 Solution: \(\begin{array}{l}\begin{array}{l} |\vec{a}+\vec{b}+\vec{c}|^{2}=(\vec{a}+\vec{b}+\vec{c}) \cdot(\vec{a}+\vec{b}+\vec{c})=\\|\vec{a}|^{2}+|\vec{b}|^{2}+|\vec{c}|^{2}+2(\vec{a} \cdot \vec{b}+\vec{b} \cdot \vec{c}+\vec{c} \cdot... View Article
Let Ai2jk Bijk And Cijk A Vector Coplanar To A And B Has A Projection Along C Of Magnitude 1 Root 3
1) 4i-j+4k 2) 4i+j-4k 3) 2i+j+k 4) None of these Answer: (1) 4i-j+4k Solution: Given, three vectors a=i+2j+k, b=i-j+k and... View Article
When The Projection Of Vector Aij4k On Vector B2i6j3k Is 4 Units The Value Is
1) 0 2) 10 3) 5 4) 3 Answer: (3) 5 Solution: Given, a=λi+j+4k and b=2i+6j+3k Projection of a on... View Article
Forces Of Magnitudes 5 And 3 Units Acting In The Directions 6i 2j 3k And 3i 2j 6k
1) 127/7 units 2) 148/7 units 3) 133/7 units 4) 139/7 units Answer: (1) 148/7 units Solution: F is the... View Article
The Sum Of The First Five Terms Of The Series 3 Plus 4 And 1 By 2 Plus 6 And 3 By 4 Will Be
(1) \(\begin{array}{l}39\frac{9}{16}\end{array} \) (2) \(\begin{array}{l}18\frac{3}{16}\end{array} \) (3) \(\begin{array}{l}39\frac{7}{16}\end{array} \) (4) \(\begin{array}{l}13\frac{9}{16}\end{array} \) Solution: \(\begin{array}{l}3+4\frac{1}{2}+6\frac{3}{4}+…\end{array} \) = 3 + 9/2 +... View Article
There Are N Urns Each Containing N 1 Balls Such That The Ith Urn Contains I White Balls If Pui C Where C Is A Constant Then Punw Is Equal To
1) 2/ (n+1) 2) 1/(n+1) 3) n/(n+1) 4) 1/2 Solution: Option (1) 2/(n+1). Given that W denotes the event of... View Article
There Are N Urns Each Containing N 1 Balls Such That The Ith Urn Contains I White Balls And N 1 I Red Balls If Pui Proportional I Then Pw Is Equal To
1) 1 2) 2/3 3) 1/4 4) 3/4 Solution: Option (2) ⅔ Let P(ui) = ki , and we know... View Article
Why Do Dielectrics Increase Capacitance
The dielectric placed between the plates of the capacitor reduces the electric field strength between the plates of the capacitor,... View Article
Which One Cu2plus Or Zn2plus Is Diamagnetic And Why
Zn2+ is diamagnetic as it has all paired electrons. The valence shell electronic configuration of Zn2+ is 3d10. Cu2+ is... View Article
Does The Energy Stored In A Capacitor Increases When The Dielectric Is Removed
There will be an increase in the energy stored in the capacitor when the dielectric is removed. The increase in... View Article
What Is The Effect Of Temperature On Dielectric Constant
The dielectric constant is inversely proportional to temperature. When the temperature increases the dielectric constant decreases.
Why Is Eddy Current Bad
Eddy current can result in the loss of electrical energy in the form of heat. There will be a magnetic... View Article
Why Is Iron Used In Transformers
The primary coil and the secondary coil is wound on the soft iron core. The soft iron core has high... View Article
Is Gallium A Semiconductor
Gallium is used in electronic devices. Gallium arsenide, gallium nitride and indium gallium nitride are semiconductors. Gallium arsenide is used... View Article
What Is The Restoring Force Of A Pendulum
In a pendulum, the gravitational force acts as the restoring force. When the pendulum is at the maximum displacement position,... View Article
Does Constant Force Mean No Acceleration
According to Newton’s second law of motion, when a constant force is applied to an object it causes the body... View Article
Why Is Hookes Law Negative
The negative sign in Hooke’s law shows that the restoring force exerted by the spring is in the opposite direction... View Article
Can A Spring Constant Be Negative
The spring constant cannot be negative. Spring constant will always be a positive value. The negative sign in Hooke’s law... View Article
