The deflection in galvanometer falls to $\left(\frac{1}{4}\right)^{\operatorname{th}}$ when it is shunted by 3 Ω . If additional shunt of 2 Ω is connected to earlier shunt, the deflection in galvanometer falls to

$\left(\frac{1}{8.5}\right)^{\operatorname{th}}$

$\left(\frac{1}{3}\right)^{\text {rd }}$

$\left(\frac{1}{4}\right)^{\text {th }}$

The number of turns in a coil of Galvanometer is tripled, then

Voltage sensitivity remains constant and current sensitivity increases 3 times

Both voltage and current sensitivity remains constant

Voltage sensitivity increases 3 times and current sensitivity remains constant

Both voltage and current sensitivity decreases by 33 %

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A circular loop of radius $r$ of conducting wire connected with a voltage source of zero internal resistance produces a magnetic field $B$ at its centre. If instead, a circular loop of radius $2 r$ made of same material having the same cross-section is connected to the same voltage source, what will be the magnetic field at its centre?

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Important Questions on Magnetic Effect of Electric Current

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 109

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is

B

. It is then bent into a circular coil of

n

turns. The magnetic field at the centre of this coil of

n

turns will be,

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 110

The dipole moment of a circular loop carrying a current

I

M

and the magnetic field at the centre of the loop is

B_{1}

. When the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the Ioop is

B_{2}

. The ratio

\frac{B_{1}}{B_{2}}

is,

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 111

A long straight wire is turned into a loop of radius $10 cm$ (see figure). If a current of $8 A$ is passed through the loop, then the value of the magnetic field and its direction at the centre $C$ of the loop shall be close to,

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 112

Two concentric coils each of radius equal to

2 π cm

are placed at right angles to each other,

3 A

and

4 A

are the currents flowing in each coil, respectively. The magnetic induction in

Wb m^{- 2}

at the centre of the coils will be

(μ_{0} = 4 π \times 10^{- 7} Wb A^{- 1} m^{- 1})

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 113

Magnetic field due to a ring having

n

turns at a distance

x

on its axis is proportional to (if

a =

radius of ring),

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 114

The magnetic field at the centre of a current carrying loop of radius

0.1 m

5 \sqrt{5}

times that at a point along its axis. The distance of this point from the centre of the loop is,

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 115

A circular coil carrying current

I

has radius

R

and magnetic field at the centre is

B

. At what distance from the centre along the axis of the same coil, the magnetic field will be

\frac{B}{8} ?

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Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 116

Magnetic fields at two points on the axis of a circular coil at a distance of

0.05 m

and

0.2 m

from the centre are in the ratio

8 : 1

. The radius of the coil is,

Important Questions on Magnetic Effect of Electric Current

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