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 %

E M B I B E

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 76

EASY

MHT-CET

IMPORTANT

Earn 100

According to right-hand thumb rule, if current is directed in upward direction then the direction of magnetic induction is,

72.73% studentsanswered this correctly

Important Questions on Magnetic Effect of Electric Current

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 77

If the current flowing in a circular loop is in anticlockwise direction then the magnetic induction will be

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 78

If the current flowing in a circular loop is in clockwise direction, then the magnetic induction will be,

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 79

The magnetic induction at the centre of loop due to current flowing through small element

d l

is given as

d B = \frac{μ_{0}}{4 π} (\frac{I d l \sin θ}{r^{2}})

where

θ

is,

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 80

The magnetic induction at the centre of a coil made from a wire of length $22 cm$ carrying a current of $0.5 A$ is,

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 81

A circular coil having $50$ turns each of radius $0.05 m$ carries a current of $1 A$ . The magnitude of magnetic induction at a point $0.2 m$ from its centre on its axis is,

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 82

Two long parallel wires are at a distance of

4 cm

. They carry currents

I

and

3 I

in same direction. Where will the field produced by both wires be zero from current

I

?

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 83

The magnetic induction at the centre of circular coil carrying current of

1.4 A

is

1.76 \times 10^{- 6} N A^{- 1} m^{- 1}

then the circumference of the loop is

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 16 - Magnetic Effect of Electric Current>Exercise 1>Q 84

A long straight wire carries a current of

50 A

. An electron moving at

10^{7} m s^{- 1}

is

5 cm

away from the wire. The force acting on electron if its velocity is directed towards the wire will be

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