Question

For Physics Newtons :-

i) What is null Point ?
ii) What is a wheatstone bridge ?
iii) On what factors does the internal resistance of a cell depend ?
iv) Which galvanometer is used in laboratories ?
v) What types of waves produces in the wire ? ​

Answer 1

Answer:

• In physics a null is a point in a field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other. ... Common situations where nulls arise are in the polar patterns of microphones and antennae, and nulls caused by reflections of waves

• A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. The primary benefit of the circuit is its ability to provide extremely accurate measurements

• The electromotive force of a cell is always greater than the potential difference across the same cell. Thus, the internal resistance of a cell depends on the factors like distance between the electrodes, the temperature, the effective area of the electrodes and the concentration of the solution.

• A galvanometer is used in laboratory for detecting the null point in electrical experiments.

• In sitar wire, transverse stationary waves are produced.

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Answer 2

Answer:

I - A point associated with or having the value zero, or at which opposing forces cancel each other out. 2Mechanics Geometry. The point of intersection of all the null lines of a given torque that lie in a given plane.

ii- Wheatstone bridge is a special arrangement of resistors as shown in the figure. There are 4 resistances R1,R2,R3and R4 arranged in such a manner thatthere is a galvanometer placed between the points B and D. The arm BD is known as galvanometer arm.

iii - The electromotive force of a cell is always greater than the potential difference across the same cell. Thus, the internal resistance of a cell depends on the factors like distance between the electrodes, the temperature, the effective area of the electrodes and the concentration of the solution.

iv - The laboratory galvanometer is a Weston Galvanometer

V - Physics

Transverse progressive.

Transverse stationary.

Longitudinal progressive.

Longitudinal stationary.

Explanation:

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