Subject: Physics, asked 4 weeks ago

## Electrical Resistivities of some substances at 20oC are given below: (a) Among Silver and Copper which is a best conductor and why? (b) Which material would you advise to be used in electrical heating devices? Why?

Subject: Physics, asked 4 weeks ago

## Three incandescent bulbs of 100W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source. (a)Will the bulb in the two circuits glow with the same brightness? Justify your answer. (b)Now let one bulb in both the circuit gets fused. Will rest of the bulbs continue to glow in each circuit? Give reason.

Subject: Physics, asked 4 weeks, 1 day ago

## Anyone please explain the question in pg 221 question 6 of physics chapter electricity ncert reader. Please explain the mathematical step. I couldn't do this.

Subject: Physics, asked 4 weeks, 1 day ago

## How can a body moves if the net force is zero. And if the net force is not zero how can the body is said to be dynamic equilibrium.

Subject: Physics, asked 4 weeks, 1 day ago

## What is dynamic equilibrium?differentiate between dynamic equilibrium and static equilibrium.?

Subject: Physics, asked 4 weeks, 1 day ago

## Consider the case, in which a mirror forms a real image of height 4 cm of an object of height 1cm placed 20 cm away from the mirror. 1. The distance from the object to its image is (a) 20 cm (b) 80 cm (c) 60 cm (d) 70 cm 2. The focal length of mirror is (a) -16 cm (b)12 cm (c) -15 cm (d) 10 cm 3. The radius of curvature of the mirror is (a) -16 cm (b) -14 cm (c) -30 cm (d) -32 cm 4. The magnification of the image is (a) 3 (b) -6 (c) -4 (d) 8 5. At what distance must an object be placed from mirror in order that a real image double its size may be obtained? (a) -24 cm (b) 32 cm (c) -40 cm (d) 45 cm

Subject: Physics, asked 4 weeks, 1 day ago

## What is Rayleigh scattering? Give essent ial condition for the same.

Subject: Physics, asked 1 month ago

## In case of circular loop carrying current, the strength of magnetic field is (a) constant everywhere (b) stronger inside the loop than outside the loop (c) weaker inside the loop than outside the loop (d) none of these

Subject: Physics, asked 1 month ago

## According to right-hand thumb rule direction of the curl of fingers of the right hand gives the (a) electric field lines (b) magnetic field lines (c) direction of magnetic field (d) direction of current

Subject: Physics, asked 1 month ago

## If a current carrying straight conductor is placed in west- east direction, then find the direction of the force experienced by the conductor due to earth's magnetic field. (a) Upward (b) Downward (c) Can't determined (d) Same as of current

Subject: Physics, asked 1 month ago

## A long horizontal power line is carrying a current of 100 A in the east-west direction. What is the direction of magnetic field at a point 1.0 m below it? (a) North-South (b) East-West (c) South-East (d) North-West

Subject: Physics, asked 1 month ago

## State the pattern of magnetic field lines for current carrying circular conductor. (a) Magnetic field lines will be concentric circles to any point of the circular loop (b) At centre, the field lines appear straight (c) Both of these (d) None of these i think , option c .

Subject: Physics, asked 1 month ago

## An object 4 cm high is placed at a distance of 15 cm in front of a convex mirror having a radius of curvature of 10 cm. Then the image formed is at a distance of?

Subject: Physics, asked 1 month ago

## Choose the wrong statement.(a) A concave mirror can form a magnified real image.(b) A concave mirror can form a magnified virtual image.(c) A convex mirror can form a diminished virtual image.(d) A convex mirror can form a diminished real image. PLS ANSWER ASAP

Subject: Physics, asked 1 month ago

## What is the direction of flow of electrons? What is meant by conventionally in the ncert reader?

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