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A magnetic dipole in a constant magnetic field has(a)zero potential energy when the torque is minimum (b)zero potential energy when the torque is maximum (c)minimum potential energy when the torque is maximum (d)maximum potential energy when the torque is maximum

The correct answer is (C)Minimum Potential Energy When The Torque Is Maximum. Explore more such questions and answers at BYJU’S.

Light wave is travelling along y-direction. If the corresponding E vector at any time along the x−axis, the direction of B vector at that time is along (A) x−axis (B) y−axis (C) -z−axis (D) z−axis

The correct answer is (D) Z−Axis Explore more such questions and answers at BYJU’S.

The Maximum Intensity Of Fringes In Young’s Experiment Is I. If One Of The Slits Is Closed, Then Intensity At That Place Becomes I0. Then Relation Between I And I0 Is

Suppose slit width’s are equal, so they produce waves of equal intensity, say I’. Resultant intensity at any point. \(\begin{array}{l}... View Article

Solve X2 – 7X + 12 = 0 By Formula Method

Given : \(\begin{array}{l} x^{2} – 7x + 12 = 0 \end{array} \) The given equation is in the form of... View Article

The threshold frequency for certain metals is v₀. When the light of frequency 2v₀ is incident on it, the maximum velocity of photoelectrons is 4×10⁶ms⁻¹. If the frequency of incident radiation is increased to 5v₀, then the maximum velocity of photoelectrons will be : (A) 2 × 10⁶ ms⁻¹(B) 2 × 10⁷ ms⁻¹ (C) 4/5 × 10⁶ ms⁻¹ (D) 8 × 10⁶ ms⁻¹

The Einstein’s equation for photoelectric effect is given by, \(\begin{array}{l} KE = hv – hv_{0} \end{array} \) where KE= maximum... View Article

Which Of The Following Is Are Functions Of Lipochondria.(A)Detoxification (B)Formation Of Acrosome (C)Chemical Modification Of Lipids And Proteins(D)Both (B)And (C)

The correct answer is (D) Both (B) And (C) Lipochondria refers to temporary storage vacuoles of lipids found in the... View Article

The weight of a body decreases by 1.5 when it is raised to a height h above the surface of the Earth. When the same body is taken to the same depth h in a mine, its weight will show (A) 3.0% Decrease(B) 1.5% Decrease(C) 0.75% Decrease(D) 0.75% Increase

The correct answer is (C) 0.75% Decrease Given weight = \(\begin{array}{l} 1.5 = \frac{\frac{GM}{R^{2}} – \frac{GM}{(R + h)^{2}}}{\frac{GM}{R^{2}}} \end{array} \)... View Article

When An Alpha Particle Of Mass M Moving With Velocity V Bombards On A Heavy Nucleus Of Charge Ze Its Distance Of Closest Approach From The Nucleus Depends On M As:

The particle’s kinetic energy will convert completely into electrostatic potential energy at the closest distance of approach. \(\begin{array}{l} \Rightarrow \frac{1}{2}mv^{2}... View Article

Two billiard balls are rolling on a flat table. One has velocity components Vx=1 m/s,Vy=3 m/s and the other has component Vx=2 m/s and Vy=2 m/s. If both the balls start moving from the same point the angle between their path is:

Sol: Components of the relative velocity of the first billiard ball is: \(\begin{array}{l} V_{x_{1}} = 1m/s \end{array} \) \(\begin{array}{l} V_{y_{1}}... View Article

An Electron Moves On A Straight Line Path XY As Shown. The Abcd Is A Coil Adjacent To The Path Of The Electron. What Will Be The Direction Of Current, If Any, Induced In The Coil?

The direction of current will be in a reverse direction The current direction is always opposite to the direction of... View Article

Three rings, each having equal radius R, are placed mutually perpendicular to each other and each having its center at the origin of coordinates system. If current I is flowing through each ring, then the magnitude of magnetic field at the common center is:

Sol: \(\begin{array}{l} \vec{B} = \frac{\mu _{0}I}{2R}(\pm\hat{i}) + \frac{\mu _{0}I}{2R}(\pm\hat{j}) + \frac{\mu _{0}I}{2R}(\pm\hat{k}) \end{array} \) \(\begin{array}{l} \left | \vec{B} \right |... View Article

The Action Of Bile Can Be Termed As(A)Oxidation (B)Esterification (C)Hydrogenation (D)Emulsification

The correct answer is (D)Emulsification Emulsification is the process of dispersing one immiscible liquid in another immiscible liquid. Explore more... View Article

Express 3186000000 In Standard Form

\(\begin{array}{l} \Rightarrow \frac{3186}{10^{11}} \end{array} \) \(\begin{array}{l} \Rightarrow 3.186 * 10^{7} \end{array} \) \(\begin{array}{l} \Rightarrow (3.186 * 10^{3}) * 10^{7} \end{array}... View Article

A small town with a demand of 800 kw of electric power at 220 v is situated 15 km away from an electric plant generating power at 440 v.the resistance of the two-wire line carrying power is 0.5 ωper km. The town gets power from the line through a 4000-220 v step-down transformer at a sub-station in the town.(a) Estimate the line power loss in the form of heat. (b) How much power must the plant supply, assuming there is negligible power loss due to leakage? (c) Characterise the step up transformer at the plant.

Given: Supply voltage, V = 220 V Total electric power required, P = 800 kW = \(\begin{array}{l} 800 × 10^{3}... View Article

Find The Work Done By Force F=2 I^ −3 J^+ K^When Its Point Of Application Moves From The Point A(1,2,−3) To The Point B(2,0,−5)

W = F * s \(\begin{array}{l} \Rightarrow (2i – 3j + k) * (i – 2j – 2k) \end{array} \)... View Article

The Number Of Chambers Inthe Heart Of A Frog Is Sushma Shekar(A)One(B)Two(C)Three(D)Four

The correct answer is (C)Three The heart of the frog has three chambers, one ventricle and two atria. Explore more... View Article

Simplify (X+2) 3 =2X(X 2 −1) And Check Whether it Is A Quadratic Equation

Given: \(\begin{array}{l} (x + 2)^{3} = 2x (x^{2} + 1)\end{array} \) The general form of quadratic equation is \(\begin{array}{l} ax^{2}... View Article

Express 6020000000000000 In Standard Form

\(\begin{array}{l} \Rightarrow \frac{602}{10000000000000}\end{array} \) \(\begin{array}{l} \Rightarrow 602 * 10^{13}\end{array} \) \(\begin{array}{l} \Rightarrow (602 * 10^{2}) * 10^{13}\end{array} \) \(\begin{array}{l} \Rightarrow... View Article

Two discs of moments of Inertia I1 and I2 about their respective axes (normal to the disc and. passing through the centre), and rotating with angular speeds ω1, and ω2 are brought Into contact face to face with their axes of rotation coincident. (A) What is the angular speed of the two-disc system? (B) Show that the kinetic energy of the combined system is less than the sum of the initial kinetic energies of the two discs. How do you account for this loss In energy? Take ω1 ≠ ω2.

(A) What is the angular speed of the two-disc system? The monent of inertia of disc\(\begin{array}{l} I = I_{1}\end{array} \)... View Article

Vermiform Appendix Is Made Up Of(A) Lymphatic Tissue(B) Excretory Tissue(C) Digestive Tissue(D) Respiratory Tissue

The correct answer is (A) Lymphatic Tissue The vermiform appendix is made up of lymphatic tissue. It is a blind-ended... View Article

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