Assertion (A): The plane of the coil of tangent galvanometer should be parallel to the magnetic meridian
Reason (R): It makes the magnetic field of the coil perpendicular to the horitzontal component of earths magnetic field so that tangent law can
be applicable

A and R are true and R is a correct explanation of A

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A is true and R is true

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both A and R are false

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A and R are true and R is not a correct explanation of A

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Solution

The correct option is A A and R are true and R is a correct explanation of A
This is the principle on which tangent galvanometer works
$B = \frac{2 μ_{o} i n}{2 r}$
$n =$ no. of turms
$i =$ current
$r =$ radius of coil
It is kept perpendicular to horizontal component of earth's magnetic field so that it ran not affect the magnetic field of coil

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Similar questions

Assertion: A proton and an $α$ - particle are projected with the same kinetic energy at right angle to a uniform magnetic field, then the $α$ - particle will move along a circular path of smaller radius than the proton.

Reason : $B q v = \frac{m v^{2}}{r}$ holds good for the charged particle moving in a circular path in a uniform magnetic field.

Choose the most appropriate correct option:

Q. Assertion: x = 3 is a line parallel to the y-axis.
Reason: The equation of a line parallel to the y-axis is x = a.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. A tangent galvanometer has a coil with

50 t u r n s

and radius equal to

4 c m

. A current of

0.1 A

is passing through it. The plane of the coil is set parallel to the earths magnetic meridian. If the value of the earths horizontal component of the magnetic field is

7 \times 10^{- 5}

tesla and

μ_{0} = 4 π \times 10^{- 7} W b A^{-} m^{- 1}

, the defection in the galvanometer needle will be:

Q. Assertion: 3 + 7 = 9 is a statement.
Reason: A sentence that can be judged to be true or false, but not both, is called a statement.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. Assertion (A)
At point P of a circle with centre O and radius 12 cm, a tangent PQ of length 16 cm is drawn. Then, OQ = 20 cm.

Reason (R)
The tangent at any point of a circle is perpendicular to the radius through the point of contact.

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).
(c) Assertion (A) is true and Reason (R) is false.
(d) Assertion (A) is false and Reason (R)is true.

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Assertion (A): The plane of the coil of tangent galvanometer should be parallel to the magnetic meridianReason (R): It makes the magnetic field of the coil perpendicular to the horitzontal component of earths magnetic field so that tangent law canbe applicable

Assertion (A): The plane of the coil of tangent galvanometer should be parallel to the magnetic meridian
Reason (R): It makes the magnetic field of the coil perpendicular to the horitzontal component of earths magnetic field so that tangent law can
be applicable